Mac Mail preview is black
I'm running High Sierra 10.13 on a MBP 15 Late 2011. In Mail Version 11.0 (3445.1.7) whenever I have multiple emails in a thread (i.e., replies) the preview screen is black. I have to individually open up the emails to view them. This doesn't behave the same way on my (slightly) newer MB Air. This is a major PITA . . . Any help/suggestions?
Bill
MacBook Pro, macOS High Sierra (10.13)