No problem- but yes! I am. I've tried opening the program a few times today to test, and it is more responsive to the first click, but only responds to the first click in the note grid.
e.g. if I click once in the node grid, it starts pencilling in the note, but I am unable through any button press, keypress or click to finish the note.
I also tried opening it up and changing the selected instrument dialog rather than clicking the note grid- when this happens, it opens the instrument select and will let me click the speaker symbols to hear a sample but won't let me actually select a new instrument, defaulting to the original instrument.
After this, I tried entering a note in the note grid again and had the same issue. (this is on the steam version, I don't know if this helps)
thanks for reading!