I was working with finder on iCloud Drive, moving and copying some files that i used with my iPad, when Finder crashed one time. So i tried to repeat the action to move another file (from iCloud Drive folder to another iCloud drive folder) and Finder crashed again... I repeated the third time this operation but finder crashed definitively... I reboot my system and finder didn't work anymore. I installed again Yosemite because i didn't want to spend much time to resolve finder issue and in my opinion El Capitan GM for sure is not ready for 30 September !!! I sent report to Apple and i hope that they resolve this BIG issue before final release.