Set up an account IMAP inside a brand new Kmail5. 
I used here a virgin install on a AMD Phenom Nvidia based PC. No prior akonadi
data. 

First observation:
the AKONADI start window throws some error (without specifying). I did save
them and will post them in an attachment. 
The account will be created correctly. However when you try to modify settings
of the account nothing happens. Then repeated tries will crash apparently
akonadi or a part of kmail because the account turn to a red flag (offline)
with the warning "unable to start". You may restart with the restart button but
after this again, no modification of the account is possible. 
New IMAP accounts are created empty, do not allow any modification. So
substantially the mail functionality on a new system is reduced to one account,
that is not modifiable. 
I tried this several times and it is stable. 
Then I tried to logout and login again: stable error 100% reproducible.

What the software does: crashes at first. Afterwards does not allow to modify
the existing account, or to modify a new one. Mail can be looked at. 

What it should do: it should be able to accept settings for a new IMAP account
(be it POP, too of course) and it should be possible to modify the settings as
foreseen.