Can't check in PDF files

Okay, before everyone jumps in with answers. let it be known:

  • I have verified user permissions allow check in
  • I have verified that state permissions allow check in
  • I have verified that folder permissions allow check in

SOMETHING is blocking check in of PDF files. This phenoenom began late last week and had previously not been an issue for 5+ years.

I am ready for your solutions!

SolidworksAdministration