Whenever notes get stuck, I find the only way to stop them is to Unload any instrument. I haven\'t had the opportunity to need this technique since I upgraded, so maybe it is more stable now. But the Player does seem unnecessarily limited.
When I first installed GPO I had system problems, as well as the pedal crash issue. It happened as standalone and in Cubase VST. But in Plogue\'s Bidule any crash was contained, and Bidule would bypass the dead instance. Very cool. Sure beats a blue screen. (Note that the pedal problem is solved in the update.)
Regarding stuck notes, I either replay the notes I was recently playing, or I replay the recent part of the sequence. Usually that gets it to stop. It\'s the fastest way that I\'ve found to get back to making music.