Why will CS4 not open DNG files converted from Olympus E-M1 raw files?

For several years I have been able to use the DNG Converter to convert .ORF raw files from my Olympus E-M1 and then open them for processing in CS4. Suddenly CS4 quit recognizing these DNG files saying "Photoshop could not complete your request because Photoshop does not recognize this type of file"
I have not changed any preferences. I'm using E-M1 v3.0, DNG Converter v8.3.0.141 on a Mac. I have deleted DNG converter several times, even reinstalled an earlier version but nothing changes.
However, CS4 will open DNG files converted from Pentax raw .PEF files from my K-5. Weird. It's the Olympus raw DNG conversions that won't open.
I can view the DNG converted files in question in Mac's Preview just fine but not CS4. Any ideas will be appreciated.

Be sure the DNG Converter's compatibility is set to provide support for your version of ACR:
Benjamin

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