To fix the Color Picker of TextMate 2 under OS X Mavericks (10.9), do the following: open
~/Library/Application Support/TextMate/Managed/Bundles/Bundle Support.tmbundle/Support/shared/lib/ui.rb, near lines 74-75 replace “AppleScript Runner” with “System Events”. That’s it.
If you want to edit the file in TextMate itself, use the following command:
mate "/Users/-your-username-/Library/Application Support/TextMate/Managed/Bundles/Bundle Support.tmbundle/Support/shared/lib/ui.rb"
(For some reason ~ does not expand correctly to the path to my home folder).