Done, and the reason for the problems... was the picture file, original too big, 605 kb. I downsized the picture to a small 50 kb file and uploaded it. Members usually prepare their picture before using it as avatar, a small file like 50 to 70 kb is fine, yours just went over the max picture size on the forum, 600kb, and this applies to any upload, avatars as well. The confusion came from the forum program not giving a proper error message in this case.
btw, any big file below 600kb posted as avatar is resized automatically by the forum program and should work.
Best is to prepare the avatar yourself, pixel size is max 175 x 175, and I recommend the filesize to be under 75 kb.
The picture is great, maybe include the full size picture in a post ? (but get it under 600kb first!)
ps, Anita, I guess this will help you as well.
Thanks