i do a fresh install of opensuse 13.1
then
i do a fresh install of kde 4.12
then
i configure kmail : i create 2 identities , different folders
then
i import my mails with kmail import tool from local-mail in my mandriva in another partition .

all is ok .
kmail runs well . i send mails , i receive mails .

i can access to my mails in all of the folders , i can view , read them .

after a while i see in kmail window all my folder are disappearing just in face of my eyes .

it remain just 
local folders
inbox
sentbox
outbox
draft

and all is empty i lost all my mails

after that i create again identities and new folders and favorites
but just after a few seconds all disappears

then

i used akonadiconsole to see what is the folder structures in akonadi : same .

then

i decide with akonadi to create again all my folders (not the default one)
the first attempt to create a folder : the folder is created then disappears .
after i can create all the folders i need .
then
i quit akonadiconsole
then
with kmail i finish to create count , filters etc .

but when i go to scan the contents of ~/.local/share/local-mail/ folder there is nothing .
it seems that all is stored in akonadi db .

i checked that ~/.local/share/local-mail/ is the path for local folder

my addressbook and my calendar are well duplicated in a local storage

it seems that kmail has created the akonadi version of my folders but no local version .

all is ok .
kmail runs well . i send mails , i receive mails .

i can access to my mails in all of the folders , i can view , read them .

this morning
i boot my pc
then i open a kde session
then
 have 2 notifications :

Dossiers locaux : Le dossier « Maildir » « » pour la collection « » est non valable.
Dossiers locaux : Le dossier « Maildir » « » pour la collection « » est non valable.

in english : local folders : "Maildir" " " for collection " " is not a valid one .

in "local-mail" there are :
cur
new
tmp 

i am not alone with this problem

with mandriva 2010.1 i686 , kde 4.8.4 (5 ?) no pb

a sub-problem :
how to populate local-mail from data in akonadi db ?




Reproducible: Always