I already PM'ed Ralle about this issue, as many people (me included) have this problem.
- Unable to save image
- Image has the wrong file extension
Oddly enough, vBulletin seems to confuse image types.
If you use a PNG, it tells you that the GIF image has the wrong file extension and vice versa. Happens for various filetypes.
Oh, and the "profile picture" is called an Avatar.