It seems that Modplug Tracker has a tendency to play one of my files whenever I play/pause a song. What I mean is that if I play a song, then do subsequnt pauses and plays, the file plays even if it is not in the song. I am not sure if this is a bug or something that I did wrong or perhaps did not do at all. I noticed this when I was making a playthrough of a game.
I noticed that Modplug Tracker would also not open the file. I logged off and logged back on to Windows and that seems to fixed the issue. I am guessing that there was a hung process that had that file open. This would explain the inability to open it later. I am not sure about the playing on each play/pause operation though. That is odd.
...i have no idea what you are talking about.
It sounds like a process of OpenMPT is still open after you closed the application, which somehow catches the play/pause.
Do you use keyboard shortcuts for this? Have you closed and opened modplug tracker, or perhaps even have it opened twice?