Yesterday the deepin screenshot app stopped working. I uninstalled it and reinstalled it several times and still nothing. The only thing I can relate this to is to the fact that I tried to use NVIDIA drivers and failed (When I open 'NVIDIA X Server Settings' I get a dialog message saying I donnot appear to be using NVIDIA drivers and I'm told to run nvidia-xconfig in terminal, from which I get a 'command not found').  It's a shame cause it seemed like a great app (this is my 2nd day on Deepin). What should I do?