Maybe you've got an autohandler/dhandler that ignores errors?
Restart apache?
http://search.cpan.org/~drolsky/HTML-Mason-1.40/lib/HTML/Mason/Admin.pod#ERROR_REPORTING_AND_EXCEPTIONS

In reply to Re: mod_perl / Mason syntax errors silently ignored by Anonymous Monk
in thread mod_perl / Mason syntax errors silently ignored by tomazos

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