I've been using Paint.net for most of a year now, and I've been problem free until today. I'm drawing something at a huge size and Paint.net has been lagging a bit. It crashes. Fine. I reopen the picture and try to save it as a PNG. Fine. It forgets to tell me to flatten the image. Not fine. I try to open it in Windows Photo Gallery and it cannot recognise the file: Not fine. It manually flatten the image. Fine. Photo Gallery still doesn't recognise it! Not fine. I look for an uninstaller. Can't find one. ...Meh. I delete the folder and reinstall... to find a heap load of problems. After consulting the forums and reinstalling Paint.net properly, I realise I still can't save as a PNG properly. Any help?
EDIT: Sorry if I sounded impatient.