Steve, Stas I experienced the same on Linux-Intel ( Apache 2.0.48, Perl 5.8.2) having a threaded MPM (worker). Everything works fine with MPM (prefork) on Linux-Intel and Linux-PPC.
I assume Steve is running the Apache under the special NT MPM and not in prefork. So maybe there's something not really thread-safe (wild-guess). Maybe this helps. Mit freundlichen Grüßen / Best Regards Swen Schillig -- Reporting bugs: http://perl.apache.org/bugs/ Mail list info: http://perl.apache.org/maillist/modperl.html