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After installing Thunderbird 45.1.1 on Windows, I cannot use the up/down arrow keys to scroll through messages

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After installing Thunderbird a few times ago on Windows, I cannot use the up/down arrow keys to scroll through messages because once I select a message, the message content window pane takes focus.

https://support.mozilla.org/en-US/questions/1126622 is a similar problem but the solution chosen wasn't very helpful in my case.

After installing Thunderbird a few times ago on Windows, I cannot use the up/down arrow keys to scroll through messages because once I select a message, the message content window pane takes focus. https://support.mozilla.org/en-US/questions/1126622 is a similar problem but the solution chosen wasn't very helpful in my case.

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To diagnose problems with Thunderbird, try one of the following:

  • 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.
  • Restart the operating system in safe mode with Networking. This loads only the very basics needed to start your computer while enabling an Internet connection. Click on your operating system for instructions on how to start in safe mode: Windows 8, Windows 7, Windows Vista, Windows XP, OSX
If safe mode for the operating system fixes the issue, there's other software in your computer that's causing problems. Possibilities include but not limited to: AV scanning, virus/malware, background downloads such as program updates.