Right-click your toolbar, select Menu Bar.

Now, View|Layout and recover your folder pane. And Help will be there too.

Right click of tool bar brings up Customize. Customize goes nowhere. Can't even open up Thunderbird after closing.

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Thank you!

Two screenshots attached. I got this after I uninstalled my 38.5.1 build and installed a download of a full version of 38.6.0 from the Thunderbird download page. I uninstalled/reinstalled after the partial patch and full patch automated updates failed several times. Results after the full automatic updates were identical to the screenshot. In order to get a functioning Thunderbird back, I've used Win10 system restore every time.

Right clicking on the toolbar brings up a "customize" wizard tag that doesn't do anything when clicked.

I can get account inboxes to show if I right click them and select "Open in New Tab", but the blank account window on the right occurred when I selected one account in the left column, but the menu tab remained on the account I hadn't selected.

FYI: My OS is Win10. My Security Software is Norton Internet Security.

Follow up: I reinstalled 38.5.1 from a download I got from http://ftp.mozilla.org/pub/thunderbird/releases/38.5.1/win32/en-US/ . The attached image below is what I saw when Thunderbird opened after the installation. When I tried the reinstall, I quit Thunderbird 38.6.0, but the 38.5.1 installer told me it was still running. I opened the task manager, and the Thunderbird process was running in the Processes window, but the "Fewer Details" window did not show Thunderbird running.

Do you have the calendar add-on (Lightning) installed?

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Yes, I did have Lightning installed, but it I see it is incompatible with 38.5.1 so I just removed it.

Matt said

Do you have the calendar add-on (Lightning) installed?

I tried the update with Lightning removed, and it worked fine. Thanks for your help.