Okay, now here are a few things:
@Everyone who's materials don't work: My materials are the moodiest things. Sometimes everything I put in come out BaseWhite and sometimes everything works. If your material thing is like mine, which it probably is, you need to wait until the moment is right and it works.
@Lizzie: Open Map Maker, if you are referring to editing the size of the object in the map, go into the last tab and make sure the object you are putting in has a thin white box around it. You will see these options:
X:
Y:
Z:
This is where you alter the Length, Width, and Height of the object chosen. Here is a small image guide as to what I mean:
*The Middle one is Height. It was altered in the process of going through Photobucket. xD
I hope this helped. If you have any other questions about the size and stuff just ask me. :3