Contact Easyscor and he will help you with your arena issues getting it up and running. He is part of the AvA group that builds terrains and helped write the most recent terrain editor manual.
How many gents ask their questions tell you that they want the answer they want and nothing else. They will split hairs down to separating molecules and dismiss anyone not Hitech telling them how something works, even if he says the same things. Then half the time after they get his attention, they treat Hitech to the same hair splitting down to the splitting of the molecules when they don't get the answer they want. Meh, I shaved all the hairs off that subject and got ride of the molecule splitting for several pages of posts. And for the less skilled at computers, my answer covered enough depth to give the less skilled a good idea of the process and saved all those molecules from being assaulted with splitting.
Save the molecules.....