It's an intermittent problem, but frustrating. Every other day or so, PD won't open, not from the CAM, not from the shortcut, not from going directly to the exe in the program folder. The only thing that works is to reboot my computer (Windows 10 64bit). When this happens, the other Director Suite programs all work (launching from CAM), only PD seems affected. Any thoughts?

I edited the topic but it doesn't seem to have worked - I am using PowerDirector 365 through Director Suite.

EDITED: I should have Googled first. Found a helpful YouTube that directed me to go through Task Manager - even though it wasn't 'open' in the apps list, it was still open in the background processes. Right-clicked, 'end task', and voila - shortcut and CAM work again.