On Monday 21 November 2005 03:32 pm, Eric K wrote: > I just upraded to Ruby 1.8.3 (from sources) on my Redhat Linux box. > When I attempt to do anything that starts a new thread, I receive the > message "ThreadError: uninitialized thread - check > `Thread#initialize'". Below is a transcript from a one-line session in > IRB that demonstrates the problem. Any ideas? (Please let me know if > there is other information that would be helpful in diagnosing this.) The ruby executable links against libruby18.so. If you downloaded and installed ruby into /usr/local or something like that, perhaps at runtime your new ruby binary is still linking against the older ruby library. A quick use of 'ldd' will help determine that. Caleb