Stuck on Secondary

This program is exactly what I needed and it saves me so much effort. But when I have my cursor on the secondary computer I get stuck if focus is on the desktop. I can switch fine if I have focus on a program like Firefox or what-have-you. Or on the taskbar. But if I click on the desktop I cannot move back to the primary computer. It only happens in this direction. I can move from primary to secondary with no problems. I am using the "prevent switching in the corners" and "prevent switching in full screen" options. This happened seemingly randomly as it was previously working just fine and to my knowledge I have changed nothing that could affect it.

Thanks for any help that can be offered!