Same here, i tried to reinstall the client, but no luck.
Here is a log from the Starup, i hope this help:
04-22 21:51:03:118 0x4f67938 OCC::Account::resetNetworkAccessManager: Resetting QNAM
04-22 21:51:03:119 0x4f67938 OCC::ConnectionValidator::checkServerAndAuth: Checking server and authentication
04-22 21:51:03:120 0x4f67938 OCC::ConnectionValidator::checkServerAndAuth: Trying to look up system proxy
04-22 21:51:03:146 0x4f67938 OCC::SocketApi::slotNewConnection: SocketApi: New connection QLocalSocket(0x75568c8)
04-22 21:51:03:120 0x89fbde8 OCC::SystemProxyRunnable::run: virtual void OCC::SystemProxyRunnable::run() Starting system proxy lookup
04-22 21:51:03:147 0x4f67938 OCC::ConnectionValidator::systemProxyLookupDone: No system proxy set by OS
04-22 21:51:03:149 0x4f67938 OCC::AbstractNetworkJob::start: !!! OCC::CheckServerJob created for “https://cloud.example.com” + “status.php” "OCC::ConnectionValidator"
04-22 21:51:03:330 0x4f67938 OCC::CheckServerJob::finished: status.php returns: QMap((“edition”, QVariant(QString, “”) ) ( “installed” , QVariant(bool, true) ) ( “maintenance” , QVariant(bool, false) ) ( “needsDbUpgrade” , QVariant(bool, false) ) ( “productname” , QVariant(QString, “Nextcloud”) ) ( “version” , QVariant(QString, “11.0.2.7”) ) ( “versionstring” , QVariant(QString, “11.0.2”) ) ) 0 Reply: QNetworkReplyHttpImpl(0x7556a78)
04-22 21:51:03:331 0x4f67938 OCC::ConnectionValidator::slotStatusFound: ** Application: ownCloud found: QUrl( “https://cloud.example.com/status.php” ) with version “11.0.2” ( “11.0.2.7” )
04-22 21:51:03:332 0x4f67938 OCC::AccountState::slotConnectionValidatorResult: AccountState connection status change: “Undefined” -> "Credentials Wrong"
04-22 21:51:03:332 0x4f67938 OCC::AccountState::setState: AccountState state change: “Getrennt” -> “Konfigurationsfehler"
04-22 21:51:03:334 0x4f67938 unknown: QString::arg: Argument missing: “https://docs.nextcloud.com/desktop/2.2/” , 2
04-22 21:51:03:334 0x4f67938 unknown: QString::arg: Argument missing: “https://docs.nextcloud.com/desktop/2.2/” , 2
04-22 21:51:03:336 0x4f67938 OCC::FolderMan::slotAccountStateChanged: Account "User@cloud.example.com” disconnected or paused, terminating or descheduling sync folders
04-22 21:51:03:337 0x4f67938 OCC::Account::resetNetworkAccessManager: Resetting QNAM
04-22 21:51:03:338 0x4f67938 OCC::ConnectionValidator::checkServerAndAuth: Checking server and authentication
04-22 21:51:03:339 0x4f67938 OCC::ConnectionValidator::checkServerAndAuth: Trying to look up system proxy
04-22 21:51:03:339 0x89fbde8 OCC::SystemProxyRunnable::run: virtual void OCC::SystemProxyRunnable::run() Starting system proxy lookup
04-22 21:51:03:341 0x4f67938 OCC::ConnectionValidator::systemProxyLookupDone: No system proxy set by OS
04-22 21:51:03:343 0x4f67938 OCC::AbstractNetworkJob::start: !!! OCC::CheckServerJob created for “https://cloud.example.com” + “status.php” "OCC::ConnectionValidator"
04-22 21:51:03:517 0x4f67938 OCC::CheckServerJob::finished: status.php returns: QMap((“edition”, QVariant(QString, “”) ) ( “installed” , QVariant(bool, true) ) ( “maintenance” , QVariant(bool, false) ) ( “needsDbUpgrade” , QVariant(bool, false) ) ( “productname” , QVariant(QString, “Nextcloud”) ) ( “version” , QVariant(QString, “11.0.2.7”) ) ( “versionstring” , QVariant(QString, “11.0.2”) ) ) 0 Reply: QNetworkReplyHttpImpl(0x8af8960)
04-22 21:51:03:518 0x4f67938 OCC::ConnectionValidator::slotStatusFound: ** Application: ownCloud found: QUrl( “https://cloud.example.com/status.php” ) with version “11.0.2” ( “11.0.2.7” )
04-22 21:51:03:519 0x4f67938 OCC::ConnectionValidator::checkAuthentication: # Check whether authenticated propfind works.
04-22 21:51:03:519 0x4f67938 OCC::AbstractNetworkJob::start: !!! OCC::PropfindJob created for “https://cloud.example.com” + “/” "OCC::ConnectionValidator"
04-22 21:51:06:096 0x4f67938 OCC::OCUpdater::backgroundCheckForUpdate: virtual void OCC::OCUpdater::backgroundCheckForUpdate() checking for available update
04-22 21:51:06:327 0x4f67938 OCC::NSISUpdater::versionInfoArrived: Client is on latest version!
04-22 21:51:30:518 0x4f67938 OCC::AbstractNetworkJob::slotTimeout: virtual void OCC::AbstractNetworkJob::slotTimeout() OCC::PropfindJob(0x7681910) Timeout QUrl( “https://cloud.example.com/remote.php/webdav/” )
04-22 21:51:30:518 0x4f67938 OCC::AbstractNetworkJob::slotFinished: void OCC::AbstractNetworkJob::slotFinished() 5 “Operation abgebrochen” QVariant(Invalid)
04-22 21:51:30:518 0x4f67938 OCC::PropfindJob::finished: PROPFIND request not successful, http result code is 0 ""
04-22 21:51:30:519 0x4f67938 unknown: QIODevice::read: device not open
04-22 21:51:30:519 0x4f67938 OCC::AccountState::slotConnectionValidatorResult: AccountState connection status change: “Credentials Wrong” -> "Timeout"
04-22 21:51:30:519 0x4f67938 OCC::AccountState::setState: AccountState state change: “Konfigurationsfehler” -> "Netzwerkfehler"
04-22 21:51:30:519 0x4f67938 OCC::AccountSettings::showConnectionLabel: “Keine Verbindung zu Nextcloud auf https://cloud.example.com
Operation abgebrochen"
04-22 21:51:30:521 0x4f67938 unknown: QString::arg: Argument missing: “https://docs.nextcloud.com/desktop/2.2/” , 2
04-22 21:51:30:521 0x4f67938 unknown: QString::arg: Argument missing: “https://docs.nextcloud.com/desktop/2.2/” , 2
04-22 21:51:30:523 0x4f67938 OCC::FolderMan::slotAccountStateChanged: Account "User@cloud.example.com” disconnected or paused, terminating or descheduling sync folders
04-22 21:51:35:096 0x4f67938 OCC::Account::resetNetworkAccessManager: Resetting QNAM
04-22 21:51:35:097 0x4f67938 OCC::ConnectionValidator::checkServerAndAuth: Checking server and authentication
04-22 21:51:35:098 0x4f67938 OCC::ConnectionValidator::checkServerAndAuth: Trying to look up system proxy
04-22 21:51:35:098 0x89fbde8 OCC::SystemProxyRunnable::run: virtual void OCC::SystemProxyRunnable::run() Starting system proxy lookup
04-22 21:51:35:101 0x4f67938 OCC::ConnectionValidator::systemProxyLookupDone: No system proxy set by OS
04-22 21:51:35:102 0x4f67938 OCC::AbstractNetworkJob::start: !!! OCC::CheckServerJob created for “https://cloud.example.com” + “status.php” "OCC::ConnectionValidator"
04-22 21:51:35:282 0x4f67938 OCC::CheckServerJob::finished: status.php returns: QMap((“edition”, QVariant(QString, “”) ) ( “installed” , QVariant(bool, true) ) ( “maintenance” , QVariant(bool, false) ) ( “needsDbUpgrade” , QVariant(bool, false) ) ( “productname” , QVariant(QString, “Nextcloud”) ) ( “version” , QVariant(QString, “11.0.2.7”) ) ( “versionstring” , QVariant(QString, “11.0.2”) ) ) 0 Reply: QNetworkReplyHttpImpl(0x8af6930)
04-22 21:51:35:283 0x4f67938 OCC::ConnectionValidator::slotStatusFound: ** Application: ownCloud found: QUrl( “https://cloud.example.com/status.php” ) with version “11.0.2” ( “11.0.2.7” )
04-22 21:51:35:284 0x4f67938 OCC::ConnectionValidator::checkAuthentication: # Check whether authenticated propfind works.
04-22 21:51:35:284 0x4f67938 OCC::AbstractNetworkJob::start: !!! OCC::PropfindJob created for “https://cloud.example.com” + “/” "OCC::ConnectionValidator"
04-22 21:52:02:280 0x4f67938 OCC::AbstractNetworkJob::slotTimeout: virtual void OCC::AbstractNetworkJob::slotTimeout() OCC::PropfindJob(0x8b549c8) Timeout QUrl( “https://cloud.example.com/remote.php/webdav/” )
04-22 21:52:02:281 0x4f67938 OCC::AbstractNetworkJob::slotFinished: void OCC::AbstractNetworkJob::slotFinished() 5 “Operation abgebrochen” QVariant(Invalid)
04-22 21:52:02:281 0x4f67938 OCC::PropfindJob::finished: PROPFIND request not successful, http result code is 0 ""
04-22 21:52:02:281 0x4f67938 unknown: QIODevice::read: device not open
04-22 21:52:02:281 0x4f67938 OCC::AccountSettings::showConnectionLabel: “Keine Verbindung zu Nextcloud auf https://cloud.example.com
Operation abgebrochen"
04-22 21:52:02:283 0x4f67938 unknown: QString::arg: Argument missing: “https://docs.nextcloud.com/desktop/2.2/” , 2
04-22 21:52:02:283 0x4f67938 unknown: QString::arg: Argument missing: “https://docs.nextcloud.com/desktop/2.2/” , 2
04-22 21:52:02:285 0x4f67938 OCC::FolderMan::slotAccountStateChanged: Account "User@cloud.example.com” disconnected or paused, terminating or descheduling sync folders
04-22 21:52:07:095 0x4f67938 OCC::Account::resetNetworkAccessManager: Resetting QNAM
04-22 21:52:07:096 0x4f67938 OCC::ConnectionValidator::checkServerAndAuth: Checking server and authentication
04-22 21:52:07:097 0x4f67938 OCC::ConnectionValidator::checkServerAndAuth: Trying to look up system proxy
04-22 21:52:07:098 0x89fbde8 OCC::SystemProxyRunnable::run: virtual void OCC::SystemProxyRunnable::run() Starting system proxy lookup
04-22 21:52:07:101 0x4f67938 OCC::ConnectionValidator::systemProxyLookupDone: No system proxy set by OS
04-22 21:52:07:101 0x4f67938 OCC::AbstractNetworkJob::start: !!! OCC::CheckServerJob created for “https://cloud.example.com” + “status.php” "OCC::ConnectionValidator"
04-22 21:52:07:283 0x4f67938 OCC::CheckServerJob::finished: status.php returns: QMap((“edition”, QVariant(QString, “”) ) ( “installed” , QVariant(bool, true) ) ( “maintenance” , QVariant(bool, false) ) ( “needsDbUpgrade” , QVariant(bool, false) ) ( “productname” , QVariant(QString, “Nextcloud”) ) ( “version” , QVariant(QString, “11.0.2.7”) ) ( “versionstring” , QVariant(QString, “11.0.2”) ) ) 0 Reply: QNetworkReplyHttpImpl(0x8af8e60)
04-22 21:52:07:283 0x4f67938 OCC::ConnectionValidator::slotStatusFound: ** Application: ownCloud found: QUrl( “https://cloud.example.com/status.php” ) with version “11.0.2” ( “11.0.2.7” )
04-22 21:52:07:284 0x4f67938 OCC::ConnectionValidator::checkAuthentication: # Check whether authenticated propfind works.
04-22 21:52:07:284 0x4f67938 OCC::AbstractNetworkJob::start: !!! OCC::PropfindJob created for “https://cloud.example.com” + “/” "OCC::ConnectionValidator"
04-22 21:52:34:282 0x4f67938 OCC::AbstractNetworkJob::slotTimeout: virtual void OCC::AbstractNetworkJob::slotTimeout() OCC::PropfindJob(0x8b54878) Timeout QUrl( “https://cloud.example.com/remote.php/webdav/” )
04-22 21:52:34:282 0x4f67938 OCC::AbstractNetworkJob::slotFinished: void OCC::AbstractNetworkJob::slotFinished() 5 “Operation abgebrochen” QVariant(Invalid)
04-22 21:52:34:283 0x4f67938 OCC::PropfindJob::finished: PROPFIND request not successful, http result code is 0 ""
04-22 21:52:34:283 0x4f67938 unknown: QIODevice::read: device not open
04-22 21:52:34:283 0x4f67938 OCC::AccountSettings::showConnectionLabel: “Keine Verbindung zu Nextcloud auf https://cloud.example.com
Operation abgebrochen"
04-22 21:52:34:285 0x4f67938 unknown: QString::arg: Argument missing: “https://docs.nextcloud.com/desktop/2.2/” , 2
04-22 21:52:34:285 0x4f67938 unknown: QString::arg: Argument missing: “https://docs.nextcloud.com/desktop/2.2/” , 2
04-22 21:52:34:287 0x4f67938 OCC::FolderMan::slotAccountStateChanged: Account "User@cloud.example.com” disconnected or paused, terminating or descheduling sync folders
04-22 21:52:39:095 0x4f67938 OCC::Account::resetNetworkAccessManager: Resetting QNAM
04-22 21:52:39:096 0x4f67938 OCC::ConnectionValidator::checkServerAndAuth: Checking server and authentication
04-22 21:52:39:097 0x4f67938 OCC::ConnectionValidator::checkServerAndAuth: Trying to look up system proxy
04-22 21:52:39:097 0x89fbde8 OCC::SystemProxyRunnable::run: virtual void OCC::SystemProxyRunnable::run() Starting system proxy lookup
04-22 21:52:39:100 0x4f67938 OCC::ConnectionValidator::systemProxyLookupDone: No system proxy set by OS
04-22 21:52:39:101 0x4f67938 OCC::AbstractNetworkJob::start: !!! OCC::CheckServerJob created for “https://cloud.example.com” + “status.php” "OCC::ConnectionValidator"
04-22 21:52:39:280 0x4f67938 OCC::CheckServerJob::finished: status.php returns: QMap((“edition”, QVariant(QString, “”) ) ( “installed” , QVariant(bool, true) ) ( “maintenance” , QVariant(bool, false) ) ( “needsDbUpgrade” , QVariant(bool, false) ) ( “productname” , QVariant(QString, “Nextcloud”) ) ( “version” , QVariant(QString, “11.0.2.7”) ) ( “versionstring” , QVariant(QString, “11.0.2”) ) ) 0 Reply: QNetworkReplyHttpImpl(0x8af9010)
04-22 21:52:39:281 0x4f67938 OCC::ConnectionValidator::slotStatusFound: ** Application: ownCloud found: QUrl( “https://cloud.example.com/status.php” ) with version “11.0.2” ( “11.0.2.7” )
04-22 21:52:39:281 0x4f67938 OCC::ConnectionValidator::checkAuthentication: # Check whether authenticated propfind works.
04-22 21:52:39:282 0x4f67938 OCC::AbstractNetworkJob::start: !!! OCC::PropfindJob created for “https://cloud.example.com” + “/” "OCC::ConnectionValidator"
04-22 21:52:42:418 0x4f67938 unknown: Failed to resolve EGL function eglGetPlatformDisplayEXT (Die angegebene Prozedur wurde nicht gefunden.)
04-22 21:52:42:419 0x4f67938 unknown: static QWindowsEGLStaticContext* QWindowsEGLStaticContext::create(): Could not initialize EGL display: error 0x3001
04-22 21:52:42:420 0x4f67938 unknown: static QWindowsEGLStaticContext* QWindowsEGLStaticContext::create(): When using ANGLE, check if d3dcompiler_4x.dll is available