Not sure what you mean by importing from members galleries. If your referring to vbulletin's little profile pic thing there was a little beta importer for vb3 many years ago that went nowhere. There is no supported script for such a thing in vb4.
Your forum index has no photos because yes you have not uploaded any.
Your gallery is shut down so not like I can physically see what your issue might be but your files and users directories are suppose to be 777 permissions for files to be created. You can try using the maintenance tool in vbgallery admin to rebuild thumbs etc. You may not have your image processor set correctly but like I said since things are locked up so I can not see hard to provide you support.