Motion crashing each time I modify keyframes in editor

Question

Every time I try to modify one of the parameters of keyframing in Motion's editor, it crashes and I need to reboot. Everything else seems to function normally, with this only specific exception.
I was wondering if anyone was experiencing the same or had some fix. I'm on 2 Gig RAM.
Thank you!

Answer 1

So - one day on the Pro Video support line, two trips to the Apple Store and one replacement machine later, I have an answer that may help if you have an ATI graphics card.
There seems to be an issue between Motion and ATI video cards when it comes to the Keyframe Editor. I have the ATI Radeon X1900 card, but this Keyframe Editor problem was replicable in a Macbook Pro with an ATI card as well. We tested it across several machines in the store and it was just the ones with ATI in the video slot that had this problem.
There is not a solution for this at this time, but there is a fairly simple workaround rule:
Always start keyframing on any object with the Record button - you will then be able to use the Keyframe Editor to modify the keyframes of that object. You can even add keyframes to the object and modify those - however, if you do this and then start to modify another object that hasn't been started off with keyframes from the Record button, you will have the same hard freeze issue. Seemingly, it is as simple as that.
I have Motion working fine on my machine and have yet to have the problem repeat if I follow this rule.
I have not, however, tried this in modifying behaviors or particles with keyframes, but I suspect if you hit Record and modify the values in the Inspector, you should get the same result.
Keep posting any problems that persist, as Apple is being made aware of the issue by the techs at the SF store. Gotta say they were pretty persistent in getting to the bottom of this and finding a workaround, especially Michael in the Business unit - thanks to all!
2 x 3GHz Dual-core Intel Xeon, 4GB RAM   Mac OS X (10.4.8)