Signal 11 means "segmentation fault," and can be caused by everything from hardware problems to a severe software bug. The classic test is to try and compile a very large program, like the Linux kernel. If the compiler crashes with a signal 11, you could be looking at hardware problems. If it's just lynx, it could be a bug in Lynx or the compiler. Have you rebooted recently? Yes, I know, rebooting a Linux box is almost a capital crime for some people, but as long as it's your personal machine, and isn't a server, it won't hurt anything. Other than that, if it seems to be a problem with Lynx itself, you could compile it with debugging support, and run it under gdb to see what was happening when it bombed. You could also try older versions to see if it's specific to the version you were trying to run.
