Yes, as I said, the subfolders exist on the drive. And they have e-mails.

Surgeweb shows them.

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Subject: [SurgeMail List] re:  Missing folder on IMAP
Sent: Wed, 19 Mar 2014 17:30:08 -0500
From: surgemail-support <surgemailHIDDEN@t@netwinsite.com>
To:
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> That's unusual.  If you look with SurgeWeb do you see the folders?
> Also if you look on the server do the subfoldres exist and do they
> contain anything?
>     tellmail pathHIDDEN@yz.com <mailto:user@xyz.com>
>     cd (path)/mdir
>     ls
>  
>         ChrisP.
>  
> 
>     I have an account where I see not folders (besides New Mail) in my
>     Thunderbird clients (multiple).
>      
>     However there are lots of subdirectories on the drive and there used to
>     be folders before.
>      
>     I also saw that despite my settings to move deteled mails to "deleted
>     items", they are not there.
>      
>     (Running Version 6.5a-1)
>      
>     I did restart Surgemail and deleted and readded the account on the
>     client with no change.
>      
>     Thanks for your help
>      
>     Stephan
>      
> 
>  
> 
>