After upgrading to 10.5, I discovered that a whole bunch of stuff involving Quartz CoreImage and Composer was broken. As an example, here's some, but not all, of what I saw:
iChat crashing when it did anything with video
Photo Booth refusing to show effects samples
QuartzComposer crash on launch
CoreImage Fun House would only allow a few filters to be used
You might get console messages like this:
11/5/07 2:32:55 PM Quartz Composer Visualizer[227] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[FILTER_NAME_HERE load:]: unrecognized selector sent to instance 0x15195000'
Well apparently the interface to ImageUnits has changed in some way, because it turns out that th...