"Search Messages" dropdown boxes are black since upgrade
Since I upgraded to Thunderbird 78, when I try to search through saved e-mails, the dropdown menus (to, for example, select "To" or "Date" for the search criterion) are black so that I cannot see what criterion I'm getting before I select it. (Once I select, the criterion does appear in black type on a white background.) Same problem for the adjacent dropdown menu (to select, for example, "doesn't contain", or "is"). I'm running Windows 10 Pro.
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Run TB in safe mode (hold Shift when launching). Does it look different? If so, change the hardware acceleration setting in Options/General/Indexing, or reset the toolbars and controls.
I tried all of those suggestions, and still encountered the "blackout" of the dropdown menus.
Attached is a picture of my search window on TB 78.3.4/W10 with a lightweight theme; the Windows color settings are dark for the Window mode and light for the app mode. I can't say why your result is different, but I would recommend you try it in a new profile: Help/Troubleshooting, about:profiles, create a new profile, add an account, and test the display.