[Avid-L2] Trouble stopping a playing sequence (sometimes)

I had this problem sometimes in Composer 4.0.5 also. Sometimes I'll be happily editing along, hit play, hit stop (Space Bar) at the right point, but Composer keeps playing. I end up pressing the space bar a bunch of times while clicking in the time line both amongst the clips (Smart Tools not enabled) and on the TC bar at the bottom of the timeline. At some magical, random point, Composer gets the message and stops, then spends a little time executing all the crazy commands I just gave it. I don't remember if this happened in an HD project or not; currently I'm working in a mostly SD format project, but this problem also happened in full SD projects in v4. Any thoughts?

Here's the gear:

Mac 10.6.3, 2x2.66GHz 8-core, 12GB Apple RAM w/updated Adrenaline BOB from the Composer 5 upgrade. Composer 5 upgrade was done according to the manual (unintall 4, install 5, etc).

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