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Can't see any emails after upgraded to 115.

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My Thunderbird was upgraded to 115 automatically, and now I can't see any emails (old and new). Just a blank page. I don't have a backup. How can I resolve this issue? Tried the troubleshooting mode, but didn't help. I've been using TB since 2006, and have thousands of emails in my profile, so can't just create a new profile.

My Thunderbird was upgraded to 115 automatically, and now I can't see any emails (old and new). Just a blank page. I don't have a backup. How can I resolve this issue? Tried the troubleshooting mode, but didn't help. I've been using TB since 2006, and have thousands of emails in my profile, so can't just create a new profile.
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Chosen solution

Thank you, christ1. As suggested, I changed the theme several times, and restarted Thunderbird as well as the OS multiple times, but those did not solve the issue.

I found one of my accounts showed the garble folder name (username was omitted from the screenshot). I removed that account, restarted Thunderbird, and I could see the folders and emails in the email pane, so it seems that this account caused the issue. I took a profile backup before doing this, and I could reproduce the issue by just restoring the profile. Confirmed that removing the account fixed the problem after TB was restarted.

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The versions is 115.6.1 (64-bit) on Windows 11.

The error console shows the following error:

Uncaught (in promise) NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIMsgFolder.server]

This seems to be the same issue reported in Bug 1869685.

https://bugzilla.mozilla.org/show_bug.cgi?id=1869685

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Chosen Solution

Thank you, christ1. As suggested, I changed the theme several times, and restarted Thunderbird as well as the OS multiple times, but those did not solve the issue.

I found one of my accounts showed the garble folder name (username was omitted from the screenshot). I removed that account, restarted Thunderbird, and I could see the folders and emails in the email pane, so it seems that this account caused the issue. I took a profile backup before doing this, and I could reproduce the issue by just restoring the profile. Confirmed that removing the account fixed the problem after TB was restarted.