As Pfunk pointed out, there was a logic error which occurred if you deleted the contents of your customavatar table...
I
did sat in the instructions and in the install script that I did not recommend that you empty the custom avatar table unless you really (really) had a good reason to do so.
In any case, the code is now fixed. Visit the
instructions page and make the necessary modifications to
member.php - the other files do not need to be altered if you have already hacked them.
If any of your members' avatars are not showing up, simply get them to re-upload their avatar and it will fix itself.