Originally Posted By: B.D.Thomas
Found a workaround:

Under 'Preferences -> MIDI Driver' I had always my master-keyboard as 'Input Driver' and Microsoft GS Wavetable Synth as 'Output Driver'.
When I unselect the latter and chose '<No MIDI/sound output>' the problem is gone.


Ya, that is exactly as I have it set.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Screenshot 2023-01-04 134953.jpg (100.75 KB, 76 downloads)

BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, Motu Audio Express 6x6 - My SoundCloud (Tip: No need to create a SC account to hear music - just hit ESC ).