I've had this issue on two of my Macs - but has anyone else? As you can see in the screenshot, the highlight color for the sidebar has changed from white to black. It seems to only happen once I add more than one account to Mail. Is there any way to reset or fix this issue?
Hmm - I actually "fixed" it myself - when I use a color profile that isn't "Color LCD', the text shows up black. When I set it back to Color LCD and restart Mail, it's white.