I detected a pattern already. With any other window focused, the cursor doesn't disappear when you do a "first touch" in the mixer panel. Once in there, the behaviour is back to normal (cursor disspears). So far this is absolutely reproduceable for me. Open arrange/main page, open the mixer below, select something in your arrange, then touch a mixer fader = cursor doesn't dissapear. Same when opening a plugin (which automatically focuses it's window).
cursor_dissapear.gif
Ah, very interesting. Same behaviour for me too. We're getting somewhere.