Yes, that may be one of the issues. In case of section access, is not unsual to get locked out if some settings are checked in the Document Properties. But if that is not your case, then I'd bet for a corrupted file.
I'd try uninstalling version 11 and reinstalling version 9, and try to open the document in Desktop. If that works, then is a compatibility issue, although the QVW file format should open just fine in version 11.
If the file is actually corrupted, I'm afraid there is no way to open it.
Anyway, try the reinstallation of version 9 in any case.