Hi, During a simulation (after some seconds) ODE open a message box with this message: assertion "0" failled in collision_cylinder_box.cpp:964. Every time it works OK but one time ... every one have an idea ? Laurent. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://q12.org/pipermail/ode/attachments/20060607/8e29e6ec/attachment.htm