When rotating the phone in the Settings activity in mobile layout, there are rendering issues.
If possible you can attach a debug log: https://forums.bitfire.at/topic/749/read-before-posting-what-s-required-to-diagnose-a-problem
I solved the problem: some owncloud app added an invalid character in the xml answer to the client request. now it works great, thanks for your efforts!
@sputtene I have sent the APK by email.