Thanks for the updated preset, Steve.
OK - with Steve's export preset, watermark preset and graphic, I just did two exports of 240 JPEG files: One on Windows 7 and one on Windows 8.1. In both cases I got 240 JPEGS with no anomalous White - blank images.
Note: on the Win 7 machine there is no SSD drive and 12 CPU cores on the 8.1 there is only an SSD drive and 4 CPU cores.
So, the bad news is we still do not have a duplicatable failure.
Are any of you running any other applications which may have the folder to which you are exporting tied up temporarily - ie. Via Bridge, Dropbox, Creative Cloud, etc?
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