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Why is it that when I delete a message in my inbox another message is sometimes deleted too?

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Sometimes the message directly above or below the massage I have deleted is deleted too.

Sometimes the message directly above or below the massage I have deleted is deleted too.

Alla svar (4)

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Stuck key? Does it happen if you delete using mouse or menus instead of keyboard delete key?

Does it happen if you start Thunderbird in safe mode?

 https://support.mozilla.org/en-US/kb/safe-mode
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Usually a bad mouse. Do you have a spare to try?

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I'm using a mouse to delete. Haven't tried safemode. I can't say that it happens often or regular enough to reliably mess up. When it happens it kind of sneaks up and it's a while before missing emails that need to be followed up on are noticed. It cleared up last time when I turned Mozilla off and restarted it. Could it be corrupt code? I redownloaded Mozilla but the problem creeps back.

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It's a pretty old mouse. I'll get a new one.