Hi Brian, I just read your posting on the mason mailing list. It seems even to fail with Perl 5.00503 when compiled with enabled thread support. What error do you exactly get? On our site it says after some reloads: System error while serving site1.foo.com / (referer=, agent=Mozilla/4.61 [en] (X11; I; Linux 2.2.15 i686)) Can't upgrade that kind of scalar at /usr/lib/perl5/HTML/Mason/ApacheHandler.pm line 498. Debug file is '6'. Full debug path is '/usr/local/mason/debug/anon/6'. Nothing else in the error log. No mason components are called in the requested file. It should just print "bla". [EMAIL PROTECTED]