Hi there scottkeen,
It seems that you have tried all the basic troubleshooting steps in configuring multi-user access. Now, I recommend calling in to our support to check on your file.They have the tools and resources to help them investigate this more. You can reach us through:
Choose a Topic and look under the Connect with a QuickBooks Expert section to see our updated phone numbers and speak with the technical support representative.
We appreciate your patience and understanding.