Recently, my avatar changed to "Pending Approval", which I don't know why. Each time I try to upload it, it is still like that.

It isn't only you this happened to, i am guessing everybody including me, and the reason might be that "Gametracker" is performing this to prevent a violation of the "Avatars",such as spam pictures or pictures with censored content...

But this is just a guess ,maybe a very accurate one xD

Mine is the same.. even wallpapers... Oh well...

We are in the process of auditing user generated image content. Profile images should be completed withing the next day or two.