If I click on a message in the messages-list, they don't appear in the message-pane
When I single-clicked on a Message in the message-list, it was displayed in the message-pane under the list. Since installing the latest version, 24.5.0 it doesn't do this anymore. It will display the message only after double-clicking, and then appears in a separate pane. After that, when I close the pane, the message will also be displayed in the message-pane.
פתרון נבחר
Try restarting with add-ons disabled from the help menu. Often such things are bad interactions with add-ons.
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Did you happen to have changed the layout via the View > Layout menu? If so, restarting Thunderbird might help (I had this myself).
Sadly no, restarting Thunderbird does not help. I also checked the View>Layout menu and didn't find anything unusual
פתרון נבחר
Try restarting with add-ons disabled from the help menu. Often such things are bad interactions with add-ons.