Ha, me too. I was just about to post about this but after reading this thread I tried the monitor the program opens on and it works fine. However, if I move it to the second monitor it won't let me use any of the buttons.
Thanks for being the one to post this solution to the phantom "custom trainer ability". Moving the trainer window to my main monitor immediately solved the problem. In trying to find an answer, I saw this unanswered question posted several times before. Rather than getting hacked that developers ran by that question numerous times without answering it, I'll be happy that a fellow member not only found the answer but also took the time to post it for the rest of us.
So, DD, thanks again for your work. : )