I think you should use caution upgrading to 3.6. On my Mac, I found the 3.6 update unstable - occasional spinning cursor hangs, false errors reading files and tons of debug messages logged to the console when editing. Most of the problems I have had appear to be connected to using DNG files, converted from Canon RAW by Lightroom.
In the end I reverted the 3.5 release, which seems to work reliably (though this isn't much help if you need the newly supported Cameras in 3.6).
Hopefully there will be another update before all development transitions to LR4...