I have tried to duplicate this and cannot. I also tried troubleshooting mode and still failed to repeat this. I type a line of txt, press enter twice (or once -- I tested both ways) and then pressed bullet icon and was able to enter a bulleted list. I suggest you try troubleshooting mode to see if an addon is interfering. I am using win 11 and 64-bit.

Afraid it behaves just the same in Troubleshooting mode!

Yes, I am sure it is not something affecting everyone else otherwise there would be loads of posts about it!

Something specific to my setup!

Just thinking about it, I am surprised I am using the 32-bit version as I have a 64-bit machine.

So, maybe I could try to remove and install the 64-bit version. If I do this then do I need to set up all the accounts again (I have quite a few!)?

Okay, go carefully. - first I encourage backing the profile up, just for safety. My approach is:

  - exit thunderbird
  - copy c:\users\<yourid>\appdata\roaming\thunderbird  to somewhere else 

- unstall thunderbird and when prompted about leaving data, allow it to stay - install the 64-bit version and start - if the profile isn't there, then exit thunderbird (important) and copy the backed up thunderbird folder to

     c:\users\<yourid>\appdata\roaming   to overwrite whatever is there

- restart thunderbird

many thanks to David for the reply and information. Fingers crossed!

Groan! I uninstalled TB and installed the 64-bit version. It restored all my accounts, settings, Add-ons and Address Books without me doing anything, which was great.

However, it is still behaving the same with lists.

Actually, I have found that if I type in the first line of the bullet list and then press the button it works. So, that will do me for now!