Hi, I've been experimenting some time with the OpenGL and GLUT bindings and there is one thing I do not understand. While I've read trough the archive and understand that the GLUT binding cannot handle more than the standard Mouse-buttons I thought handling the MouseWheel-buttons should work. However, regardless of whether I actually want to know about Mouse-Buttons my applications segfault when I trigger the WheelUp-Button. WheelDown works as expected (They are reported as button 4 and 5 in X). I don't know where that behaviour comes from - other buttons at least give an error message about the missing marshalling. I guess something is wrong with my setup as I could not find any similar error report (AMD64, linux kernel 2.6.19 (64bit), X.org 7.2, GHC 6.6.1, GLUT 2.1.1, OpenGL-2.2.1). Any suggestions how to further investigate this ? I'm willing to add hooks to the GLUT (?) package if someone can point me to the right direction... This is the output from doing a backtrace on the dumped core - not very informative... : #0 0x0000000000000000 in ?? () #1 0x00002b6f40ccd172 in __glutRegisterEventParser () from /usr/lib/libglut.so.3 #2 0x00002b6f40ccdeb2 in glutMainLoop () from /usr/lib/libglut.so.3 #3 0x0000000000411c08 in GLUTzm2zi1zi1_GraphicsziUIziGLUTziBegin_mainLoop_info () #4 0x000000000057b498 in stg_ap_0_fast () #5 0x0000000000529b98 in s5YF_info () #6 0x00002aaaaac8eaf8 in ?? () #7 0x00000000007c89d0 in ?? () #8 0x0000000000000000 in ?? () Best regards, Hendrik