Becauase Candybar messes with system icons, they have a check in their software. Everytime apple releases an update they need to release a new revision, however 9 times out of 10 the current release of candybar is fine.
The one thing I would do, is when applying an update to OSX is to turn off all theming and reset the icons back to there default. I'd had an issue once when I didn't and my candybar backed up icons failed.
Mike