Hmm… Reboot Now, that’s interesting because my functions.php file seems to work in my bbPress theme. I’m using the functions.php file to call on the BP admin bar and it works.
FYI, I’m using bbPress 1.0 alpha 6 and the default Kakumei theme.
Just tried your _get_avatar() function and it works!
Instead of mystery-man, I defaulted it to wavatar.