German spelling broken in recent builds?

[Claus]

Hi,

some recent change in Emacs stopped aspell/ispell/flyspell from
working with German Umlauts (äöüß...).
Sometime after 2008-03-05 flyspell suddenly fails to recognize any
word containing such letters.

I suspect it to be Emacs-related since I have two versions of
23.0.60.1 running in parallel and flyspell works as expected in the
former:

GNU Emacs 23.0.60.1 (i386-mingw-nt6.0.6000) of 2008-03-05 on
CJK-MOBILE   --> spelling OK!

GNU Emacs 23.0.60.1 (i386-mingw-nt5.1.2600) of 2008-03-14 on
CJK-MOBILE   --> spelling borked for German/Umlaute

If nobody remembers any change that might have caused this, I'll file
a regular "emacs -Q ..." bug report.

The recent changelog has many coding-related changes, so I'm kinda lost here.
What am I missing?

thanks,
Claus