Hi Everyone, This has been bothering me a while -- as I'm working on the Memcache++ Client that I'm maintaining and continuing to develop, when I try running the unit test(s) I've written in a specific platform I get 'mutex: Invalid argument' errors being thrown with regards to either locking, unlocking, or destroying mutexes. The platform I'm working on is: Intel Core 2 Quad CPU @ 2.40 Ghz Ubuntu Gutsy Gibbon 7.10 Linux Kernel 2.6.22-14-server (x86_64) gcc (GCC) 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2) I'm working off of Boost's SVN trunk revision 43586. The system is running in 64-bit mode (which may or may not say what the problem can be, because I don't see this problem in 32-bit systems as well as other 64-bit systems). Pointers would be greatly appreciated. -- Dean Michael Berris Software Engineer, Friendster, Inc. <dmberris@friendster.com> +639287291459