User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0

Steps to reproduce:

I start Thunderbird and the system shows as in attached pictures. My folders are not shown.

Actual results:

I upgraded from 60.7 to 68.7 on OpenSuse Leap 15.1 with KDE 5. I'm using a profile on a remote computer in order to share it from other computers. On the other computers (a windows 10 and another opensuse) I still use Thunderbird 60.7 without problems. I'm using no Add-ons.

Expected results:

I would expect 68.7 to show my folders.

Is "Folder Pane" checked under View > Layout?

Yes, it is.

I'm guessing you got a new profile? Start with "thunderbird -P" and select the one you want to use

Sorry to disappoint you :-) , but my profile is rather old. The oldest message in my Local Folder is since 2008 and the profile is most probably as old. I have created a new profile (for another mail account) to test out 68.7 and that one works perfectly. The problem shows up with my old profile. I'm mainly keen to keep my local folder and my address book. Can you give me a hint on how to move that from one profile to another I guess I could create a new profile for my mail account.

The address book is a .mab file you can just copy over. The files in local folders can also just be copied over and will be discovered when restarted.
https://support.mozilla.org/en-US/kb/profiles-where-thunderbird-stores-user-data

But anyhow, I didn't mean that your intended profile was new, but that Thunderbird probably created a new one for you (due to profile per install, and you changed what thunderbird bin location is). The other profile would still exist, only that you'd have to select it using the "-P" flag

Thanks! I'll create a new profile for my mail-account and copy the Local Folders and the .mab files over to it. I'll be back when it's done.

Because this bug's Severity is normal and has not been changed, and this bug's priority is -- (none,) indicating it has has not been previously triaged, the bug's Severity is being updated to -- (default, untriaged.)

Sorry for the delay. I had to test my new setup properly, but now I'm quite certain it works. I did as you said and created an new profile (from 68.8) on my local computer (OpenSuse) and moved my old Local Folders and address books to it. It works like a charm. I then moved this folder to a smb-server and it still works. Then I tried to access it from Thunderbird (68.8) on a Windows 10 system and it still works. The original problem is maybe still there but it is apparently not a problem anymore.

Thx, closing this then.