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Thank you!

See attached image - thank you.

I don't recognise any of that stuff to the right of "Help" . None of it appears to have any particular significance to email. What's it doing in the menu of an email client?

That is the Mac menu bar - if you're not familiar with Macs, it would look a bit "foreign" to you.

That is the Mac menu bar - if you're not familiar with Macs, it would look a bit "foreign" to you.

gvoyager9 said

That is the Mac menu bar - if you're not familiar with Macs, it would look a bit "foreign" to you.

If you look just below it - about 1/16 inch - that is the top of the Thunderbird window...and if you look very closely, you will see the remnants of the bottom of the Thunderbird menu bar buttons which have been cut off by the 38.2.0 update.

I wonder if toads solution will work here.

https://support.mozilla.org/en-US/questions/1012167

Matt said

I wonder if toads solution will work here. https://support.mozilla.org/en-US/questions/1012167

Yes Matt, it worked..the setting, "mail.tabs.drawInTitlebar" was set to "true". Changing it to "false" resolved the problem. Now, the obvious question is, "What changed it?"..the evidence suggests that the 38.2.0 update changed the defaults.

The cause I have no idea. I have seen perhaps three posting here with this sort of issue. While mac users are in a very small minority. My experience is they are a very vocal minority. So it is obviously not a universal issue.