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New Thunderbird wont allow me to send to more than one address. Wont display emails as read after opening.

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I have the latest Thunderbird installed and have recently changed computers. For some reason there is a solid black line at the top of my inbox. When a new email comes in and I open and read it, it will still appear unread in bold. If I try and hit reply to that email and add another email address in, it wont let me. The original email address is highlighted in gray. Thanks!

I have the latest Thunderbird installed and have recently changed computers. For some reason there is a solid black line at the top of my inbox. When a new email comes in and I open and read it, it will still appear unread in bold. If I try and hit reply to that email and add another email address in, it wont let me. The original email address is highlighted in gray. Thanks!

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Chosen Solution

Does it improve if you start in safe mode ? https://support.mozilla.org/en-US/kb/safe-mode-thunderbird

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Thanks so much Wayne. That worked, so I then went on to remove the addon that was causing the trouble. Cheers