After upgrading from RC6 to RC7, go to Apps to update modules. Specifically, Timeline... "Check module hash: Module was modified". Also dared to tick 'Force auto-update, even if some files were modified'... I get "Check module hash: Can't apply upgrade because too many files(50%) were modified".
Just installed RC6 two days ago, upgraded RC7 today. I haven't touch nor modified Timeline module.
Other modules upgraded went smooth.