http://bugs.winehq.org/show_bug.cgi?id=22550
--- Comment #2 from Roderick Colenbrander thunderbird2k@gmail.com 2010-05-23 14:45:14 --- What happens if you use 1.2-rc1? If the issue isn't over yet I expect it is a FreeNX issue. Especially the screen shot part sounds suspicious. I guess it is an issue on the FreeNX client side (perhaps it has some XRender bugs since XRender is used for most 32-bit related operations).
The issue seen on Ubuntu (without FreeNX) might not have the same cause but might look similar. Again first retry on Wine 1.2-rc1.