Qt 4.8.0 crashes under TightVNC

Starting with version 4.8.0, Qt doesnt work for me any more under the TightVNC server. This happens for all Qt application with a GUI.

Program received signal SIGSEGV, Segmentation fault.
0x0000003481455f0a in qt_init (priv=0x844d20, display=<optimized out>,
visual=<optimized out>, colormap=<optimized out>)
at kernel/qapplication_x11.cpp:2292
2292 kernel/qapplication_x11.cpp: No such file or directory.
(gdb) bt
#0 0x0000003481455f0a in qt_init (priv=0x844d20, display=<optimized out>,
visual=<optimized out>, colormap=<optimized out>)
at kernel/qapplication_x11.cpp:2292
#1 0x00000034813d8e19 in QApplicationPrivate::construct (this=0x844d20,
dpy=0x0, visual=0, cmap=0) at kernel/qapplication.cpp:838
#2 0x00000034813d96e4 in QApplication::QApplication (this=0x7fffffffdf50,
argc=@0x7fffffffdebc: 1, argv=0x7fffffffe128, _internal=17041408)
at kernel/qapplication.cpp:737
#3 0x000000000040d69f in main (argc=1, argv=<optimized out>) at main.cpp:54