I am using Thunderbird 78.6.1 (32-bit) on a Windows 10 machine. The problem described below is about the contents of my emails. I can see the list of emails without any problem. 1. When I read email in my inbox, I have no problems--white background and black text. 2. When I try to read email in my Sent folder, every email I have (both recent and old) is just a black box, as if I had a black background and black text. 3. When I forward a text, I can see almost none of it. Most of it is blank space, as if it was white fonts on white backgrounds. I have tried going to Tool-> Options-> and fiddled with the Fonts & Colors but nothing I change it to consistently solves the problem. Does anyone have any advice? Thank you!