>Is there a possibility that something might have been messed up in 42?
>I've had the player lock up on me (pause that can't be unpaused) twice now.

Yes, there is.
With v42, I can do this:

Start a tune playing.
Hit pause on the RIO remote.
Hold knob to enter my menus.
Hit Cancel to exit the menus: doesn't work.

Ugh. I really have to rewrite the keypress state machine in my stuff,
it has grown horribly since day 1.

Meanwhile, I'll try a quick rev to fix this but with v44 shortly, and perhaps a rewrite later.