http://bugs.winehq.org/show_bug.cgi?id=9107
--- Comment #14 from ChALkeR chalkerx@gmail.com 2007-10-13 02:23:46 --- This can be also observed in PSI 0.11.RC3 (latest). General->Options->Appearance->Choose different font. MS Sans Serif and PSI default font work fine, almost all others - have this bug.
http://downloads.sourceforge.net/psi/psi-win32-0.11-RC3.zip
I think it will be easier to first test on PSI (32 MB unpacked) then on QT4 itself (284MB with MinGW). You need 0.11, 0.10 is qt3-based.
And if setting winversion to 9x/ME or less, the fonts in the chat dialog go white (or there are just no fonts), with default font too, but this can be avoided and does not happen with default (non-9x) install.