You are not alone Linwood. After a lifetime of great shots (exposure-wise) with speedlights, I began getting blowout images (not just the highlights). My paws, dog-like hands, had the bracketing working and without my eye glasses I couldn't see it. It took me a few days to figure it out.
Also related, I let someone at the ANPAT check on my custom settings. He made some changes without noticing and I ended up with two days of jpegs only. I SHOOT RAW!