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One question:  Are you running the same version of ACR on both computers?

Unfortunately, I only have two of the most recent versions of PS / ACR installed on this computer, so I can't tell if Adobe added the warning recently.  However, FWIW, I don't recall seeing that warning until fairly recently.  OTOH, I *rarely* ever have more than one image open at a time in ACR.  If I need to make ACR-like changes to multiple files, I always use LR, not ACR.  It's non-destructive editing in LR, and one can generate, group, and otherwise manage ACR presets vastly better in LR than in ACR.

Tom M