jxsbebop wrote:MIDI notes keep getting stuck for external MIDI gear, but not any soft synths inside Ableton. Seemed like when I first installed Live 9 it may have been occasional, but now I can't get past playing a couple of progressions.
If this is only external gear you must try with another MIDI interface as well as cables just to see if you can rule these out. Or another DAW if you have access to that. You can try a demo perhaps.
Failing that, follow and analyze the MIDI stream at relevant points with internal tools like MIDIMonitor and external MIDI analyzers. It's certainly possible that MIDI is sent and your gear is ignoring some stray notes for overloading or other reasons such as internal bugs. We have old MIDIfied external gear that sometimes acts up.