Issue with SharePoint Workspace 2010 - The field AppAuthor contains a lookup to list AppPrincipals that cannot be resolved
Symptoms
When you use SharePoint Workspace 2010 Client to sync with a SharePoint 2013 Preview site, some lists cannot sync to your local position. Additionally, you receive the following error message:
The field AppAuthor contains a lookup to list AppPrincipals that cannot be resolved. The target list may not be part of this site.
Resolution
To resolve this issue, install the mentioned hotfix:
For more information please refer: https://support.microsoft.com/en-us/kb/2687364
Note: You should re-sync the lists after you apply this update.