Comment 5 for bug 1077000

Agreed that a brief informational message would be a nice temporary solution to this. I just spent 10 minutes going in a circle myself trying to edit an embedded image reconfirming my bitmap editor paths, trying different bitmaps editors, etc. Finally, I did a web search, and came right to this. But for a new or migrating user, they might not bother, and they just might assume things don't work.