Microsoft Project 2010 Import/Export

I had Microsoft Project 2007 and could import and export project plans easily using the plug in, but I recently upgraded to 2010 and installed the plug in for that version, and the same credentials and web service address return an error:

"You do not have access to this application, please contact your security admin"



What else is there I need to change so I can import/export with Microsoft Project 2010? 2007 still works on my laptop with the same credentials.