I've been using paint.net perfectly fine for a month. It was even working last night. When I tried to open it today, nothing happens. I can see in task manager that it opens for a split second before immediately disappearing. I tried the PdnRepair.exe tool and it doesn't seem to do anything, the CMD prompt comes up but instantly disappears without any text coming up. Where can I find some information to help troubleshoot, or does anyone have any idea what's going on?