Note steps 4 and 5 have to occur very quickly. (In our case we're
double-clicking a play/pause toggle button... a lot of our users are
double-click-happy, so this is a common thing to test for us.)
Has anyone seen this before?
Out of interest, are you able to reproduce it in QuickTime Payer Pro?
(on Windows)
Either way could you please file a bug, with code, demonstrating this
scenario?