I've never even used this module without also enabling warnings, maybe you need to see them too: 
use CGI::Carp qw/fatalsToBrowser warningsToBrowser/;

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Also consider rolling your own die handler at DOING MORE THAN PRINTING A MESSAGE IN THE EVENT OF PERL ERRORS

In reply to Re: CGI::Carp sometimes fails by Anonymous Monk
in thread CGI::Carp sometimes fails by Bod

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