http://bugs.winehq.org/show_bug.cgi?id=19541
--- Comment #2 from Nikolay Sivov bunglehead@gmail.com 2009-08-03 14:13:59 --- (In reply to comment #1)
It might need a specific font installed on the system. If you set font DPI to minimum 167, the text appears correctly:
http://www.alarm-clock.pl/kde.png
The same thing happens with Nowe Gadu-Gadu (a Polish IM application) - minimum of 167 text DPI and the text appears correctly. Nowe Gadu-Gadu is a QT4 application, just like KDE.
This info might be useful. Possibly duplicate of bug 18120.