I'm quite confused and not sure how to exactly describe the issue, but I'll start with the statement that everything was fine for over a week (since I actually started using Ubuntu) until 30 minutes ago.
When I started Gimp, it showed up on the launcher bar, but it wasn't responding at all. The launcher looks as below:
You can see a sort of empty arrow next to Gimp. When I click it nothing happens,
when I press Ctrl+W it's not brought to front. I've tried reinstalling it, but that didn't help.
Does anyone know how to fix this problem?