PC3 File Not Recognized on Windows Restart

We came into the office this morning and found out that Windows had installed a number of updates on our file/print server.  When we tried to print to our plotter, the .pc3 file (located on the network) was not working.  I tried to roll back the updates, but that didn't work, so I restored the server and one of the client computers back to March 22 using a disk image (clean OS wipe).  At this point, they should have both been back in the state they were in before the updates, but printing still did not work, which makes no sense to me.

What did work was deleting the plotter (HP T610 24" wide plotter) from the client machines and then reinstalling it on them.  That continues to work until the client computer is restarted.  After the restart, the only way for the .pc3 file to be recognized by AutoCAD for that plotter is to delete and reinstall it on each client machine.

The .pc3 files for our other printers remain unaffected and are working as expected.

I'm running AutoCAD 2015, but I had a similar issue with AutoCAD 2014 before that was never fully resolved.  In fact, that issue is why we have a March 22 disk image.

Has anyone experienced a similar issue before or have any idea on why this might be happening?  Thanks!