Suddenly my user Avatars aren't showing.

Suddenly my user Avatars aren't showing.
I've been experiencing issues with the site throttling and discovered that it was down to the Support plugin generating errors. I'll log that separately but once I deactivated the support plugin my user avatars stopped showing. Any attempts to re-load them just shows the generic mystery man icon/avatar.

PHP Warning: chmod() [function.chmod]: No such file or directory in /home6/********/public_html/wp-content/plugins/avatars/avatars.php on line 1206

HP Warning: unlink(/home6/*******/public_html//path/to/wp-content/uploads/avatars/user/854/user-489-96.png) [function.unlink]: No such file or directory in /home6/********/public_html/wp-content/plugins/avatars/avatars.php on line 1207

Thanks,