Look at the 4 images I've uploaded. These are example of what I am seeing in some of my email. I was having a problem with fonts now being large enough or dark enough to easily read. At first I started to change the font setting in Windows and then tried changed in Thunderbird's setting. Originally I was having a lot of problem with my computer not showing on my monitor correctly. Finally bought a new computer and installed Thunderbird on it by pasting in a backup from my old computer using the instruction found here. So I am guessing that some of the settings I was changing in Thunderbird are now part of this new install. It turns out the originally problem was a bid VGA card and the new computer solved the issue as far as how Windows 10 displays text. However I am still seeing the same problems in Thunderbird. I thought I reset the setting to default, but maybe I missed something. When I started see some email where the lines overlapped I found controls under the VIEW/MESSAGE BODY AS.... I didn't notice those setting before and was playing with fonts and sizes in the SETTINGS area under TOOLS. So part of this issue may still be an improper setting if those setting carry over when you move Thunderbird from one computer to another. In any case, how can I get my email to look correct on the screen. When the text is unreadable like in the jpg labed HDML ON I find that changing it to read as text makes it readable, but then other emails look better when I turn HDML back on. I never had this problem before the old computer started giving me a problem and I changed some of the SETTINGS in Thunderbird. So how can I check to make sure all my setting in Thunderbird are back to the default setting or whatever would be proper for reading email that shows graphics when they arrive with graphics. Right now I have to keep switching back and forth in the VIEW MESSAGE BODY AS . Thanks for your help. Fred