I havent been using it that long but I think you can just select the offending bone, then you will see its keyframes.. then click on the "selected bone translation" or "selected bone angle" dot located at what ever frame/frames causing you the problem, then in that window hit the...

I've been doing a bit of lurking here for a little while now.. I stumbled upon this software at Apples site some days back.. I am really impressed by the quality of work this application can produce.. ive only begun to fiddle with this and I knocked out an animation in no time at all.. great tutoria...

All are embiggened by the cromulance of this subject.

-jack

mplayer plays it well.