UPDATE:
I rebooted and ran the install script again, and it seems to have fixed itself, or maybe left calendar off, yes, just checked, own cloud is in maintenance mode, fine for me, but hope a fix is there for others soon. Thx!
...
Installing ownCloud (contacts/calendar)...
ownCloud or one of the apps require upgrade - only a limited number of commands are available
Checked database schema update
Checked database schema update for apps
Updated database
Disabled 3rd-party app: calendar
Disabled 3rd-party app: contacts
Update successful
Maintenance mode is kept active
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