If you want to use avatars you must use the vb3 integration.
If your links are wrong in your navbar you need to give us more info here like a url etc. We simply use the forum url you have entered in the vbulletin options to rewrite normal vb
links. If your have custom links in there you need to edit them to full url to be used over another program. Relative links only work if your running things from one directory.