The Bleach Asylum has increased the avatar sizes on all styles. They are now 192 pixels high and 192 wide.
It is advised that you re-upload your current avatars or upload new avatars. The image should be at least 400 * 400 pixels big. The image should be square.
Uploading a square image in that size means that your avatar will show properly, without blurriness and without portions of the image being cut from view.
Please follow the Customizing your avatar
tutorial. Post in the Forum FAQ
thread or ask a staff member if you have any questions.