I got an error message when trying to update my avatar. It read:

ERROR - 500

Invalid UserAction in home_settings_update_handler.php on line 69

Please contact the site administrator!

Just thought I'd let it be known...

I’m eternally stuck with Link from Majora’s Mask as my pfp here. Been this way for nearly a year at this point.

https://gamrconnect.vgchartz.com/settings/preferences/
-> Avatar Settings
-> Upload new avatar. Select Files. Browse to file. Open. Save new Avatar. Okay. Okay. Refresh.

I have 6 avatars available. I can choose between those 6 and change between them without error.
I was also able to upload a new avatar and set it. I grabbed multiple ones on my computer and each worked with no problem.
I googled random images and they worked without problems.

So you will have to give detailed instructions. What image you are using, what format. What size. Where did you get it. What do you click what when etc.

I updated the error message to have more information.