The custom button function was having difficulty switching from program to program. Ex: I have P6 and Excel open simultaneously. I had the native setting on my forward side button custom set to F9, to run the schedule in P6 and the backward side button as Enter to execute the "run the schedule" function. It always works as intended until I open another program that I have the mouse, "recommended pre-sets", set to. Like after opening Excel i go do something in there. Click back into the P6 window. I hit the forward or back mouse buttons, and they get stuck on excel's pre-sets and perform Undo and Redo. Afterward it messes up I have to close and re-open P6 as the last program opened and it begins working again with the "native" custom assigned functions. I know this is a huge coding kink to work out or perhaps just a little extra coding to recognize the window that is active. Not sure as I am not one of the badasses like y'all that put in the work. It's not a dealbreaker as I still very much love the KBM I am using, just is a little irritating that it doesn't work to it's full potential. Thanks so much for your great products!