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When writing a message, the text sometimes changes spontaneously to a very small point size, and nothing short of closing and reopening the program will fix it.

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In the midst of writing a message, the entire text of the message sometimes spontaneously changes to about 5-point type --- too small to read. If I highlight the text and try to change the font size, nothing happens. If I close the message without saving, and start a new message, the font size is still small, and will not change. If I close Thunderbird and then re-open it, everything operates fine again.

In the midst of writing a message, the entire text of the message sometimes spontaneously changes to about 5-point type --- too small to read. If I highlight the text and try to change the font size, nothing happens. If I close the message without saving, and start a new message, the font size is still small, and will not change. If I close Thunderbird and then re-open it, everything operates fine again.

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Haven't seen this complaint for a few years - what's your TB version? Do you see the same thing in safe mode (Help/Restart with Add-ons Disabled, or hold Shift when you launch TB)?

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I went to Help > About Thunderbird to check my version. It was 45.8.0, but when I checked it, it started an automatic update, so now it's 52.1.0. Maybe that will solve the problem. I could try safe mode, but since it happens sporadically, who knows whether it will occur in safe mode? Thanks for your help. I'll see if the update fixes it.

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Pay particular attention to if it occurs after you move the pointer with the mouser or paste. Also does it occur on an email address where you have a signature. There is a default -- between the mail body and the signature and removing it can result in artifacts from the signature to bleed into the body of the email

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Thanks, Matt. My signature is a graphic, so I don't think any font attributes are spilling over into the main body of the email (if I follow what you are saying). It does seem to occur when I move my pointer. My touchpad on my laptop is acting up and becoming unresponsive (wearing out), so I've switched to a wireless mouse. The touchpad problem could be part of what's happening.