I can't import images onto PC Stitch anymore without the programme freezing entirely. I've tried with multiple image types, uninstalling and reinstalling the programme, and no luck.
It was working up until yesterday night for me so I'm not sure what's gone wrong...
I came here for the same or similar problem, but got it sorted before my forum registration came through.
I had previously used that laptop with an external screen and the pop-up window was apparently opening invisibly on the other screen that was no longer attached. There seemed to be no way to access the pop-up on the laptop screen itself (tried shift + right-click on the PC Stitch taskbar icon and a few other tricks) until I connected another screen again and then could move that window back to the main laptop screen.
Others might not have the same issue, but thought I would add it just in case.