Everytime I test my level, it shuts off after two seconds or so. It happens when I try to put my own 3dos in. I know how to make templates for them and they appear and function, but they cause the level to stop. I am using solid color surfaces on the 3do, but I flagged the Geo as 3 instead of four like the tutorial said.

It sounds like something is wrong with the 3do itself. Double check to make sure all the solid colored surfaces have a geo of 3. See if there are any errors in the consistency checker (ignore nonconvex sectors).

------------------
"Sometimes nothing can be a real cool hand."
Have Lightsaber Will Travel

Like Mike said, more than likely, you just missed a colored texture somewhere. Just check em again. U could always use the find feature if it can search for the textures that are solid ( the ones u used that is, not all solid textures ). Anyway... That's prolly it if JK just disppears from ur screen.

If JK crashes during loading then it's probably a missing resource, like a 3DO or texture. If it crashes after loading then it could be because the walkplayer is outside it's assigned sector.

Okay, I checked every surface and there was only one pure color, I'm sure. I decided to change that color to a texture, and flagged it as 4 like all the others. Nothing changed. Now I've fixed some of it. Now it only shuts off when I walk on it. I am using _walkstruct so that shouldn't happen. I tried changing some top surfaces so they're flagged like a floor. That didn't work. There are four surfaces that shut off the game and they seem normal to me, but maybe you know better. The 3do is a tent, so these are sloping surfaces. The other part of the tent is an overhang over the door made of wood, and I can walk on that. Any ideas?

Try decor instead of walkstruct.

Also, check that you have accurate values for size and movesize.

i've had problems like that before... i used some mats that were in the 3do tree along with some custom mats. it would crash every time i can in viewing range of the 3do. it wasn't the template at all. i just took that mat out, and made one to see if it was a template problem, and then the 3do showed up... and no more crashes..