HELP!! Some troubles here...

So the problem is i can't changed my message's font, window, etc.
But some commands work.. like bold it, and show a picture, etc.

the question is WHY?

i add some new scripts like AMS, Animated battler by minkoff, a follower team script, and http://www.gamebaker.com/rmxp/tutorials/changing-font.htm to change font....

Help will be appreciated
Thanks

I am not entirely sure what the problem is?

This looks like a script problem, but here is what I am guessing is the problem:

You are trying to change the font using the tutorial you found, but the AMS you've found already provides a way to change the font that overrides the original method explained in the tutorial. Please link to the AMS.