Yes, I was just coming here to give an update on the issue myself. Especially since Promax announced they are no longer supporting Cache after this year, and somebody may be Googling this probably sometime next year…
I have successfully been able to use the updated version of ArGest IngestPRO to unarchive an entire TAR tape that was written with my Cache-A. All project files were working, no media offline!
Great news, thanks for everyone for the support to get this problem solved for us!