don't blame Mark
This is a known bug in 2.0 B11.

Check out the buglist forum for the details. There are no known fixes out yet.

Also, there are related Stalk issues with 2.0B11 that means the stalk commands are slow to be processed and in some cases the skip next track button can appear to become 'wedged' on in the player - which then proceeds to skip through the current track, to the next one etc all at high speed.