I have wrote an application that uses selection mode ( glRenderMode(GL_SELECTION) ). It draws some objects, and user is able to point some of them by clicking them. Everything is ok, when I run it on my PC (Win XP + Radeon 9100), it also works fine on Win XP or Win2k + GeForceMX440. But… at school, on Win98 or XP (I don’t know graphic card) it fails to render correctly. It’s ok until user clicks to select sth, then graphics stops refreshing, wglMakeCurrent returns false. Problem is, I can’t write code and test it there, only at home, where it is running correctly, but I need it to work there. I would be very thankful for any suggestions.