if needed..copy photo into your photo/pictures files then edit it to required size by changing the imaging size ..then save it..then upload to site.. I have to do this alot of times on different sites that require certain image ratios.
What format for the avatar are you trying to upload? If it's anything other than avi, bmp, gif, jpeg or jpg the system will not recognize it.
Also the image must be no larger than 80 x 80 pixels or nor more than 100 kb whichever is smaller.
The format for the avatar that I am trying to upload is JPG.