[Wine] Weird problem with UltraVNC Viewer

[occhigrigi]

Hi everybody,
i've been using ultravnc viewer from long time without any problem.
Starting from wine-1.2-rc2 when i'm connected to a vnc server i cannot close anymore the viewer window and when I try to close the window it sends an ALT+F4 to the application running in the vnc server !!
With wine until version 1.2-rc1 the viewer windows close as expected.

In console there are no messages and the application runs PERFECTLY in every aspect (a platinum one).

I'm running on openSuse 11.2 64bit.
Tried with kde with compiz and with Icewm without compiz, same problem.
The application is freely available from http://sc.uvnc.com/download/click.php?id=51

Any idea ?