Ok so I set up maximizer and all is working well. I am however having troubles with the PiP function.

I have 2 regions, wow1 and wow2. I go to region wow1 and under pip I hit f17, then I go to region wow2 and put F18. I apply the changes but it doesn't seem to have any effect. I have tried hitting both f17 and f18 on both screens but it never switches them out.. Can someone please give me advice on how to fix this?