Update

I can confirm a server end software malfunction.

I've reverted to no avatar because of it.

I suspect that contrary to the advisory that paraphrased, the formerly uploaded and/or deployed custom avatar will be deleted upon selecting any option of either, 1. no avatar or, 2. upload (new) custom avatar or, 3. a GT selectable avatar, the preceding avatar isn't actually being deleted.

Subsequently, upon selecting load custom avatar and proceeding through the upload and save sequence, the application loads all prior uploaded avatars overlayed in an image which appears as a confused multi-image and partially corrupted palette.

I've tried uploading all the acceptable formats (.png, .gif, .jpg) sized per provided guidelines max spec and lower multiple times, refreshing cache, logging out and logging back in, closing and restarting the app (Android) and browser window Win 10x64 (desktop PC), all without success. Different images as well, so I can confirm it's not caused by an actual corrupted original image palette pe se.