Actually I tried, and it seems there is nome bug:

a) Created a new user names d�d� with kuser - no problem

b) Tried to switch user: login failed, whatever password I give (name is shown 
as "dödö", maybe that's a clue for someone)

c) Created a new user dodo, with pasword 123456 - works

d) changed password for d�k�l� - login failed

Both new user login as text outside TDE

So there is some problem with accented caracters in TDE login (which of course 
is, in my opinion, a really secondary problem as you just have not to use 
these there, but there is indeed a problem).

Mostly, kuser should not accept names or passwords that it won't accept later.

Thierry