Okay, here I am asking yet another question that is probably known by just about everyone (I'm a newb. I admit it).
I'm having an object (a taxi cab, specifically) appear after certain criteria are met. The problem is that the character can walk through the object.
Any help will be much obliged.
if you mean the character walks behind the object then you should check the objects basline is set correct..
barefoot
Either draw a second walkable area where the taxi will appear and remove it or make the taxi object solid: http://www.adventuregamestudio.co.uk/manual/Object.Solid.htm
(Also, please use the manual's search function and the forum search, especially before asking a question you know to be easy.)