When switching from instrument mode with a keyboard key pressed, note off isn't sent.

[pcppcp]

Note off mesage is sent on keyboard key release, but when switching mode with a key held down, the message is probably captured by other mode's logic and not passed to Live.

[pcppcp]

as reported by Bichuelo

1. Press Mixer (Sel. Track) then select a track (I tried both an external MIDI instrument as well as an internal)
2. Press 7 (Arm track), the Record button turns Bright Red. Make sure it is bright and not opaque red, which might be lit if you simply select the track
3. Press Synth (Perform) then play a couple of notes
4. If you are currently holding a note, press:
5. Mixer (Sel. Track), the last held note(s) are stuck after you lift your finger
6. Arm another track. The notes stuck are now stopped