Try and Reboot into recovery and do the permissions fix.Tried that, still freezing. For the first time it happens to mi while typing on SKYPE. So once again, I don't think is a Safari issue. What is consistent is every time I've a freeze, I'm typing.
Could this be related? 8/8/14 18:50:24.000 kernel: Sandbox: Spotlight(285) deny file-write-create /Users/hmarsili/Library/Caches/com.apple.DictionaryServices
Try and post more stuff from logsWell, running out of ideas. Did a recovery boot, reinstall Mavericks, install yosemite PB again, did not restore from backup but copy the files. Still freezing every couple of hours, always while typing. Also, checked the permissions and everything is fine.