Except that it still happens with a fresh install
It appears to be an issue with avatars themselves. Fresh Installs with all defaults appear to only not fix the problem when you already have prefs saved onto the config under servers.
The issue is with TDM and Slayer, or any gamemode that modifies player appearance, since it must first locate the decals and thumbs.
I have yet to explain the fresh install issue, or why after deleteing bot events, the glitch was removed, only to be revived later.
You have two solutions to fix this, well actually three.
1) Delete Slayer and, TDM.
2) Re-add the original default decals and faces to their original directors before badspot moved them to the add-ons foulder.
3) Tell the creators of slayer and TDM to fix the way they locate decals/faces.