[SOLVED] Why are Subfolders of INBOX in Thunderbird recently not accessible. Profile problem?

On my Centos 5 Linux workstation I use Thunderbird to interface with my gmail account, and have 15 or more topical subfolders under INBOX where I save emails. The subfolders have in the last few days been invisible and inaccessible, though the Quota indicates they are still there. I found the following message when I looked at Troubleshooting information, so it appears to be a problem with my profile.

Could not open "pg4iqwv0.default"
Archive type not supported.

The same profile information works just fine in my Windows Thunderbird accessing the same account. I hope someone can help with suggestions.

(I don't know if it is relevant, but not long before the problem arose I had some trouble installing an app on an Android phone, which involved opening a google account and supplying a password for it. When I try to open my gmail account in a browser, it wants me to set up a new email identity.)

Originally Posted by rdnelson On my Centos 5 Linux workstation

Centos 5 is EOL!!!

I am aware Centos 5 is EOL. I provided that information to be comprehensive. That doesn't address my problem, which is why Thunderbird subfolders are not visible. The problem is new as of 3 days ago, whereas I have been running the EOL Centos and using Thunderbird for years with no problem. Do you believe the EOL does or can cause such a problem?
More important, do you have any suggestion for fixing the problem, which appears to be a problem with accessing some files in my .thunderbird profile?

Are you accessing gmail using POP3 or IMAP?

If the latter, the issue may be with the IMAP subscriptions.

Thanks. I use IMAP, but perhaps you can say more about checking and fixing issues with IMAP subscriptions.

Originally Posted by rdnelson Thanks. I use IMAP, but perhaps you can say more about checking and fixing issues with IMAP subscriptions.

If you're using IMAP, then your email is still on the server.
I'm using TB 60.8.0
In the settings for the account, at the bottom of the page is a section "Advanced Features"
There, there is a link to "Manage Folder Subscriptions"

On my server I have 13 folders. I can only see four of those in Thunderbird. I've chosen not to view the others on this desktop by de-selecting them on that dialog.
What do you see in that dialog? Are your sub-folders there?

I can't find section "Advanced Features" or "Manage Folder Subscriptions" possibly because my Thunderbird is old. About says Thunderbird ESR 10.0.3 but I don't know if that is the same numbering system as your TB 60.8.0. The closest I can find is an "Advanced" section under Server Settings, but it doesn't list folders. It does have check boxes for "Show only subscribed folders" and "Server supports folders that contain subfolders. Both are checked.

It may be that the EOL issue has somehow caused the problem after all, and I hope I can upgrade -- likely will need to do a new install.

Thank you very much for the helpful suggestions.

Originally Posted by rdnelson I can't find section "Advanced Features" or "Manage Folder Subscriptions" possibly because my Thunderbird is old. About says Thunderbird ESR 10.0.3 but I don't know if that is the same numbering system as your TB 60.8.0. The closest I can find is an "Advanced" section under Server Settings, but it doesn't list folders. It does have check boxes for "Show only subscribed folders" and "Server supports folders that contain subfolders. Both are checked. It may be that the EOL issue has somehow caused the problem after all, and I hope I can upgrade -- likely will need to do a new install. Thank you very much for the helpful suggestions.

That is the older version of TB, for sure. Probably the last one available in the CentOS 5 repositories.
Check the Help menu contents (F1) Search for something like "IMAP Folder Subscription". I'm sure it was manageable back then, I just don't recall where.

You won't be able to upgrade from ver 5 to even ver 6, let alone 7...and RedHat has released ver. 8, but it wasn't ported to CentOS yet, last time I looked. Do some reading about 7. They've switched to systemD (instead of sysV init), so there's a bit of a learning curve there. Not insurmountable, just different.

Good Luck.

If you click on a sub-folder ant it shows you the splash screen as if you are in a new inbox, try right-clicking on the sub-folder and choose open in a new tab, then go to that tab. It seems that once you do this, the sub-folder will open correctly next time. Go figure. I have hundreds of sub-folders and the process stinks but it works.