Multiple Thunderbird windows are displayed when Thunderbird 17 launches. -WORKAROUNDS-: Alt-F4 on windows. Or right click taskbar+close. Or delete session.json // fix in progress

Dear,

I updated Thunderbird to new version today morning.
After updating, two message windows are always being displayed when Thunderbird launches with message, "This folder is being processed. Please wait until processing is complete to get messages".

When I close one of two message windows, two message windows are closed.

I attached the related image.

Thank you for your help in advance.

Regards.

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