Hi, I am pretty new to Ruby although have a lot of experience in other programming languages. I'm working on a project using Ruby and the OpenGL extensions that come with it (version 1.8.5). The error is not very detailed: Vivarium.rb:118: [BUG] Segmentation fault ruby 1.8.5 (2006-08-25) [i386-mswin32] That line is GLUT::MainLoop() This doesn't really help as that's essentially the entry point for any OpenGL program, meaning the problem could be anywhere. What's the best way to debug this to get further information I've tried ruby -rdebug but I could get very far with that. I would start trying to run/step through the program and get warnings about includes that I'm not even directly referencing and can't seem to get to the breakpoint I want. I could use some help on that too if anyone is familiar with the built in debugger. Any help on this would be appreciated. Thanks Matt -- Posted via http://www.ruby-forum.com/.