on Feb 11, 2014 at 2:37:00 pm Last Edited By Stanley Sousa on Feb 11, 2014 at 4:07:45 pm
Sorry for the bad English, but could not help but share the result I got .
Since last week was unable to switch between optimized media and proxy and neither off background rendering .
I have been following many posts reporting errors with FCPX 10.1.1 after installing Mavericks 10.9.1.
I used Disk Warrior , I cleared the preferences (Preference Manager - Digital Rebellion), caches, and also all the recommendations in the help of the apple site, but not resolved.
The alternative I found was to create a new user account rather than to do a fresh install from scratch.
After using OnyX 2.8.2 for Mavericks, I believe my administrator account was corrected and FCPX started functioning normally.
I used all options in OnyX, but I believe the solution is below:
(Parameters > Login), leave the Administrator users and Local Users and click Restore Defaults.
(Parameters > QuickTime), Restore Defaults.
After this procedure, able to change between proxy and optimized background rendering and off normally.
I think that may be an option for some rather than create a new account.
Hope that helps.