https://bugs.winehq.org/show_bug.cgi?id=34587
--- Comment #16 from WineBuG winebugs140@gmail.com --- (In reply to Maik Wagner from comment #15)
(In reply to WineBuG from comment #14)
Is it possible that you have font anti-aliasing turned off system-wide?
I can certainly check. But how?
Here's some info on font anti-aliasing in XFCE: http://docs.xfce.org/xfce/xfce4-settings/appearance