Dave,
I will explain how to regenerate the Item table again to see if this was the issue. However if this doesn't fix your issue, I would suggest contacting us with Method Support turned on for your acount, this was we can go in and double check some settings.
Renerate Item table:
From within Method, go to the Customize Tab, then click the Tables/Fields tab link. Locate the table labelled "Items", click "edit table" for the item record. You should now have a pop-up window labelled "Fields for 'Item'", from here simply click the "Finished editing Fields". By doing what is mentioned here, this should regenarate the item table, then try loading the items screen again from the QuickBooks Tab Group.
If this did not resolve your issue, please email us directly at support@methodintegration.com, please also include you the Method Account name you login with, as well as your contact information. In order to enable the MethodSupport User, you will need to go to Customize Tab, then Users. From this screen find the user "Method Support", and make sure there is a check for the "Active" column.
-Ben