This happens frequently. When a popup decides to open and quickly close, or a window decides to crash or something like that. Leaves a white square that is on TOP of everything, really annoying. Only way to fix is restart groupy (turn on/off)
It was being very laggy and everything seemed very crashy... Fresh windows rebuild on M2 ssd. Not my system.
Windows 10 Pro version 2004, build 19041.450. 50" 4K TLC tv as my Monitor. 3840x2160. i7 9800x, GTX2080, C:\ on M2 SSD. 32gb ddr4. When my pc goes to sleep, which it is set to do every night after inactivity. After waking up, Groupy firmly breaks itself. Showing an invisible grey bar far off to the left of the screen, nowhere near any other title bars. Cant open or close tabs, dragging the window is super laggy, cpu spiking to 6-10% which for my pc is high lol. Seems to fix