Custom validation is not being called on production server but works on localhost

[eluser]Joshua Logsdon[/eluser]
If this is at an impasse then I would start breaking it down to basics.

If you have what Greg last said on your local app (which goes along with http://ellislab.com/codeigniter/user-gui...aries.html) and it is working, I would go as far as overwriting (or removing first) the live site. Maybe it's something silly where a file isn't getting updated or it accidentally got moved to the wrong location (system/libraries vs application/libraries).

If it's double-checked it is the same set of files then it sounds more like a server issue. If making sure files are current and set up properly didn't work, what are the specs for your local XAMPP (I'm guessing Windows) and the live server (I'm guessing LAMP)?