As an example, I have a windows 7 group policy that has 10 revisions. If I go back to any previous revision and sandbox it, make changes and then publish it again, the policy fails to download to the clients.

The resulting error is:

There was an error while accessing content for policy "Restricted Student Windows 7 Group Policy". The error was - "Path for the group policy content is null."

To resolve, I have to edit the policy again by using the policy helper, and after reuploading and publishing again, the policy can again deploy.

I've tried this with a few policies and it seems consistent. Is this a common issue or do I maybe have a ZCM 11 server problem?