Actually I tried, and it seems there is nome bug:
a) Created a new user names dödö 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 dökülä - 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