I've used AlbumPlayer for years, I'm trying to get it working on new system, this one is Windows 10 and everything seems to work great but when in PARTY MODE when I use my WeaveFuture USB Bill Acceptor Software every time I put a dollar in it takes my 1920x1080 resolution of the maximized full screen AlbumPlayer and resizes it down to what seems to be 800x600 window. This hasn't happened to me on the old setup with the same bill acceptor software and the same monitor. Just have a new PC and a new operating system (old one was Windows 8.1). I've tried all the different PAINO BLACK theme settings, I disabled and enabled the ALLOW RESIZE check box. I've ran both programs in Windows Compatibility Mode. Nothing seems to fix it. Any help would be greatly appreciated. Thanks

Does this coin acceptor generate key presses? Might it be that a key code just trigger resizing? I have no idea what else might cause it.

Yes I do think it's just adds keyboard strokes. I use the F8 key to add credits which when just pushed on a keyboard doesn't resize the window just when entered. This entire setup worked perfectly on an older machine running Windows 8.1. This new machine with the same bill accept software, same AlbumPlayer settings same monitor now resizes. Just seems odd.

Just after some googling I see ALT-F8 is a shortcut to resize your window. So it might be that your coin acceptor send something like ALT-F8 . Can you try alternative code, just to see if behavior changes.