I recently updated paint.net to beta 4.0.5168.12074 and I can no longer copy an image in firefox (27.0.1) and paste it into paint.net. (right click-> copy image, open paint.net, paste)
The exact error is "The clipboard doesn't contain an image."
I can copy an image in firefox and paste it fine into Windows 7's paint and GIMP.
I can also copy an image in both Chrome and IE and paste them fine into paint.net.
Attempting to 'Paste into New Image' gives the following error:
System.NullReferenceException: Object reference not set to an instance of an object.
at PaintDotNet.Actions.PasteInToNewImageAction.PerformAction(AppWorkspace appWorkspace) in D:\src\pdn\paintdotnet\src\PaintDotNet\Actions\PasteInToNewImageAction.cs:line 81
Attempting to 'Paste into New Layer' gives the "The clipboard doesn't contain an image." popup.
I disabled all firefox addons yet the problem persists.
If my memory serves me correctly, this most recent update to paint.net has been the start of this issue occuring.