[MarkFL]

A down and dirty fix would be to go to your "memberinfo_block_ministats" template, and near the bottom locate:

<img src="{vb:raw prepared.avatarurl}" alt="{vb:rawphrase xs_avatar, {vb:raw prepared.username}}"  {vb:raw prepared.avatarsize} id="user_avatar" />

and replace it with:

<img src="{vb:raw prepared.avatarurl}" alt="{vb:rawphrase xs_avatar, {vb:raw prepared.username}}" id="user_avatar" onload="this.src = this.src.replace(/\/thumbs/,'');" />

This will replace the src attribute of the avatar with the URL of the full-sized avatar.