My php scripts aren't registering $HTTP_GET_VARS variables anymore!

Assuming you didn't make any changes to your scripts, it's likely that your hosting provider upgraded their version of php . 

The $_GET superglobal variable replace $HTTP_GET_VARS, so older scripts coded using that variable will break at some point.  An easy fix if you have this problem is to put this line near the top of the broken script:

$HTTP_GET_VARS = $_GET;

That should get the script working again!