how do you cut out person out on an image so it just person and no background using GIMP?
JOEY & MOLLY SPEARS PWA WORLD HEAVYWEIGHT CHAMPION/PWA WOMEN'S CHAMPION
PWA INTERCONTINENTAL CHAMPION (1st EVER/5 TIME/MOST REIGNS)PWA PRESTIGE CHAMPION (1st EVER)
PWA TAG TEAM CHAMPION (2 TIME)/MONEY IN THE BANK WINNER (2014)
PWA PURE CHAMPION/PWA HARDCORE CHAMPION
GRAND SLAM TOURNAMENT WINNER (2013 & 2014)/QUEEN OF THE RING WINNER (2015)
ROOKIE OF THE YEAR (2013)/ WRESTLER OF THE YEAR (2014)/WOMAN OF THE YEAR (2015)
Have you tried making the avatar slightly smaller than the maximum dimensions? Also try putting a border around the transparent avatar in the largest allowable dimension but make it the colour of the forum background (C9C9C9).
I created my current avatar in Photoshop with a transparent background, re-sized it so it fits within the 125 x 125 non member limits and it seems to work okay. If I upload the large version without re-sizing it first, it is automatically re-sized and the background fills in white.