[bluebrooks]

there are quite a few things that could go wrong....
i.e., the pak file might be built wrong. (you say it's not, i know)
is your pak file named correctly to precede the regular pak files?
did you put your pak in the correct folder?
is this server-side? (you havent said)
are you altering the correct tik file?
is your code in the tik file in the right place, and under the correct setting (multiplayer, single, or realistic)