Welcome, welcome. I have a tutorial that will help you prevent your forum from being hacked and spammed.
any signs of a possible hack? go to your nearest xat and panic like crazy. next, pick a random user, and blame them for hacking attempt. there is a 1% chance that this user is the haxor!
next, ban, unban, ban, repeat process. you banned them, so they must be the haxor!
this may not be enough proof, so do this: unban the user, cuss him out and treat him/her badly. this will result in rants and stuff. they are defending themshelves, but they are against your forum- so they must be the haxor!
so use this guide to save your forum from being haxed!