This is probably related to Unicode/UTF-8 characters, and has been fixed in SoulseekQT. However, since the old client did not handle Unicode/UTF-8 properly, some incompatibility is expected.
QT only handles Unicode and doesn't provide any simple way to use distinct codepages, so it's unlikely this will ever get fixed.
This what i have in RUSSIAN room.http://dl.dropbox.com/u/44080020/TEMPslskQt.png
Can't see my language in chat rooms.
How to solve this problem?
UPDT: It's on Windows 7x86.
See my last comment in this thread.