Hi Stephanie,
Looks like we'll need to investigate this problem, so I srongly recommend that you contact us via our Contact Support form (
http://smartbear.com/support/message/?prod=TestComplete) - this will give higher priority to your support case.
In the Contact Support form, please answer the following questions:
1. How the project was originally added to VSS - via TestComplete or via the native client?
2. Are your VSS credentials (login/password) valid?
3. Do you seen any dialog windows when you open the project in TestComplete? If you do, send us an image showing the dialog.