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Why does my curser jump to the first line when I push thd shift button?

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This occurs when I am typing an e-mail. Is this some type of a short cut?

This occurs when I am typing an e-mail. Is this some type of a short cut?

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I would be more inclined to think it is an issue with some add-on you are using.

Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode). On the Help menu, click on "Restart with Add-ons Disabled". If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender.