Minitaur playing early

I wonder if anyone could advise on a way to combat a strange behavior:
Setup:
Windows XP, Reaper. Minitaur Editor and recording of a track (MIDI) are working fine.
However …
The Issue:
When I dis-arm the Minitaur midi-track I have just recorded it plays the sound consistently EARLY (by about 1/2 second), although all MIDI notes are quantized.
When I arm the track back - it plays what I had recorded on-time! (No other instrument, virtual or physical, behaves like that - just Minitaur).
Any ideas?
Thanks!

After vigorous trial&error poking-around I think I figured out how to avoid the above mentioned problem:
In Reaper I went to Options > Preferences > MIDI Devices … and disabled “Moog Minitaur IN” (leaving only “Moog Minitaur OUT”).
I hope it will help someone else too.
:unamused: