Cache-a restore problems

I am having problems restoring an LTO-5 tape from a Pro Cache5 device. Using drag-and-drop method as well as full tape restore isn't working. The error we continue to get is "Error: Substituting `.' for empty member name". We tried to restore from a different tape and it worked. It seems we have a corrupt tape. Does anyone have any suggestions on how to recover the data? That tape is the only place it lives and a client wants to revisit something from a project on the tape.

Thanks

Mark