Camera Raw 9.12.1 Issue [Unable to open Raw files from Canon T2i]

I recently deployed the CC suite to a computer lab in an education environment.  These are device licenses.  This was a deployment package that was created this week ie: not an old install package.  All went well and my students were able to start editing RAW photos.  We shoot on two different cameras, a Canon Rebel 2Ti and a Canon 70D.  Today I finished the install on my machine (brand new out of the box 2017 iMac) and when I tried to start editing a group of photos taken on both cameras I ran into problems.  The photos shot on the 70D open in the Photoshop CC 2017 Camera Raw window fine but the photos taken with the 2Ti do not.  I get the "Photoshop cannot open this file" dialogue box.  Checked the Camera Raw plugin info and it is running 9.12.1.790.  I tried running updates anyway but there was no change.  I also downloaded and installed the Camera Raw plugin separately with no change.  I can't figure out why this one machine would not open the older camera raw files while others will.  Any advice on how to proceed?  I would rather not use the DNG convertor as a long term solution.  Both cameras are supported in Raw so I shouldn't have to!  Thanks for any help or suggestions!