Hello. nice bike! and yes, there seems to be some problem with your picture when the program attempts to convert to an avatar. Will look into it.
Edit: Looks ok now. Still testing out.
...and seems it's something in the particular picture file DSC01515.jpg that prevents conversion to .png for use as avatar. I opened your picture in photoshop, then re-saved it with no modifications, then uploaded it as avatar in your profile (as a large file, the forum resizes automatically), and it worked.
Never seen this problem before, out of curiosity: from which program was DSC01515.jpg originally saved (there was no exif data).
e