Lost a keyboard shortcut

I have lost my looper shortcut, where you press P and shift P to select track and set up the purple looper option. I get a cue saying my on screen keyboard filter would not allow it.
I have searched the internet and walked through all the ways to add and delete the filter. It doesn’t change the cue when using Cubase. I did not have this problem last weak. I did a few updates and now I have the problem. Anybody have a sure way to around this? As I said, I’ve tried all the internet help and nothing worked. It will make my work much better with the shortcut.