This is my (and others) issue. The upgrade goes smoothly enough but, as soon as the cron job runs and invokes occ the server resources max out and the whole thing freezes.
Very sad. I have tried twice, once upgrading using the web updater and the other I uninstalled NC20 and started with a fresh installation. Same thing happened.
I seem to be stuck for now. But, I will hope that jumping to 22 will be a goer
James
