I am running blender 2.49 on my Mac OS X. Just recently blender stopped working. When I open blender it starts normally but then a pink bar appears on the screen and blender shuts down and gives me and my computer says that blender quit unexpectedly. I tried downloading blender again but the same problem occurred. I also have Blender 2.5 but I still need Blender 2.49 to work.
Could be your OpenGL driver.