Fatal error: Call to a member function - on New Server

I moved a client to a new server. The client has both a retail and a wholesale store that are set up as complete separate installs. IE Different DB One is run in on a sub-directory the other on a Sub Domain... After the move, The wholesale install will not allow log in to the admin section. It is producing the error - Fatal error: Call to a member function isLogged() on a non-object in ----catalog/model/catalog/product.php on line 8 - Now what I find interesting is that although I am logging into the Admin section, this is pointing to the store front Catalog directory???

I have verified that the code that this error points to is identical in both installs - the retail install is working fine.

Wholesale install = Sub Domain
Retail = sub-directory

I have removed all of the VQMOD XML files to see if one of them was responsible for the error, to no avail.
I really am trying to avoid having to do a complete reinstall on this client.

Any information would be greatly appreciated!

Hi, did you ever find a fix for this?

I am having a very similar problem after moving my cart onto a new server. Thanks.