Thunderbird 6.0.2 - Problems to create subfolders

Hello,

After an upgrade to Thunderbird 6.0.2,
when I right-click on a folder, the "New Subfolder" option don't appear
if the option "server support folders that contains sub-folder and 
message" is off.
It is possible to create a new subfolder (Folder only type) when 
right-clicking
on the "account" and choosing "New Folder" but only one folder in each 
subfolder.
To create subfolders "Message only" the option "server support folders 
that
contains sub-folder and message" must be set to "on".

Another strange thing: When I restart Thunderbird and right-click on a 
Folder,
I see the "New Subfolder" option, but only once.
So to create a subfolder and 3 sub-subfolders, I have to restart 
Thunderbird 4 times.

We never had this problem with previous versions of Thunderbird (2.x 
3.x)

I wonder if anybody have seen the same problem, if the problem is on 
Thunderbird
side or on the IMAP server side, and if there is a workaround.

IMAP server version: UW imap 2007e

Best Regards
Didier
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