This afternoon, Apple released updates to the following software:
Final Cut Pro 6.0.5
Compressor 3.0.5
Color 1.0.3
Shake 4.1.1
Here is a link to the release notes:
http://www.apple.com/support/releasenotes/en/Final_Cut_Studio_2.0_rn/
My suggestion is to wait a week or two before upgrading to make sure there aren’t any unpleasant surprises in this version.
And NEVER upgrade in the middle of a project.