I have just upgraded to NC 12, and now it reverts back to the default theme.
I have in config.php
the line:
theme => '<theme>';
and have the subfolder: /var/www/nextcloud/themes/<theme>
The tree-structure for the theme folder is:
├── core
│ ├── css
│ │ └── styles.css
│ └── img
│ ├── 1920x1080
│ │ ├── 01-Early-Morning.jpg
│ │ ├── 01-Early-Morning.png
│ │ ├── 02-Mid-Morning.jpg
│ │ ├── 02-Mid-Morning.png
│ │ ├── 03-Late-Morning.jpg
│ │ ├── 03-Late-Morning.png
│ │ ├── 04-Early-Afternoon.jpg
│ │ ├── 04-Early-Afternoon.png
│ │ ├── 05-Mid-Afternoon.jpg
│ │ ├── 05-Mid-Afternoon.png
│ │ ├── 06-Late-Afternoon.jpg
│ │ ├── 06-Late-Afternoon.png
│ │ ├── 07-Early-Evening.jpg
│ │ ├── 07-Early-Evening.png
│ │ ├── 08-Mid-Evening.jpg
│ │ ├── 08-Mid-Evening.png
│ │ ├── 09-Late-Evening.jpg
│ │ ├── 09-Late-Evening.png
│ │ ├── 10-Early-Night.jpg
│ │ ├── 10-Early-Night.png
│ │ ├── 11-Mid-Night.jpg
│ │ ├── 11-Mid-Night.png
│ │ ├── 12-Late-Night.jpg
│ │ └── 12-Late-Night.png
│ ├── background.jpg -> /var/www/nextcloud/themes/<theme>/core/img/1920x1080/05-Mid-Afternoon.jpg
│ ├── favicon-fb.png
│ ├── favicon.ico
│ ├── favicon.png
│ ├── favicon-touch.png
│ ├── favicon-touch.svg
│ ├── logo-icon.png
│ ├── logo-mail.gif
│ └── logo.png
But none of my logo’s or background is shown. I have also disabled the Theming app and that didn’t change anything.
Nothing in the logs points to an issue.