What can differ between environments? Check the following:
* Your code (obviously)
* Versions of other dependent packages - both in-house and third-party
* Versions of other installed in-house modules
* Versions of other Perl CPAN modules
* Processes which didn't die when you restarted the app
* Data in the database
* Number of rows in tables, i.e. is some limit being hit?
* Schema of the database
* Browser cache
* Server side web cache
* Files on disk, e.g. cached print documents
(source: a decade's experience building software)
A piggy bank of commands, fixes, succinct reviews, some mini articles and technical opinions from a (mostly) Perl developer.
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