Solidworks 2018 PDM eDrawings Revision Symbol display problem

I'm having a strange issue with the SWX PDM previewer and eDrawings.

When my revision is completed, the revision symbols don't display the letter revision.

Instead, they show a string of what appears to be data reference codes.  See below:

The file looks like this momentarily when opened in Solidworks, but resolves to the proper letter revision right away.

Has anyone else come across this problem or have a solution?

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