Hi,
Testing RadioBoss between v5.9.0.9 & v5.9.3.0, with the earlier v5.9.0.9 the 'Add to Playback Queue' function, there are no issues. When pressing the 'Q' on the keyboard more than once, the numbers increase as they normally should be. Like (1), (2), (3) etc.
Now with the latest v5.9.3.0...