It appears you are now using a legacy postbit style...since you say the hook is not present in your postbit template (I assume it has been removed), try going to your "postbit_legacy" template, and locate the code:
HTML Code:
<dt>{vb:rawphrase posts}</dt> <dd><div>{vb:raw post.posts}</div></dd>
And beneath it add:
HTML Code:
{vb:raw template_hook.postbit_userinfo_right_after_posts}
Does this fix the issue?