There is a portion of the MRI+ database that is not available from off campus: the Mediamark Reporter. If you try to clink the link to it, you get this error page:
We have been working with the vendor to identify the source of the problem and get it fixed. In the meanwhile, on-campus access to Mediamark Reporter is fine as is off-campus access to the other portions of MRI+.
11/5/2013 UPDATE: This problem has been fixed (details).