http://bugs.winehq.org/show_bug.cgi?id=21043
--- Comment #15 from Roderick Colenbrander thunderbird2k@gmail.com 2009-12-22 04:20:21 --- I checked the code again and the documentation on ClientSideWithRender is not correct as it seems to disable all XRender code in Wine. There is no real way to test whether it is the font or the other code which is the problem.