Saving changes in edit mode?

[Frankmuddy]

Hey folks. I'm editing terrain and stuff in Edit mode, but I can't get my changes to stick. How do I save the scene?

Okay, I've sort of got it... How do I get a horse in Edit mode so I can actually move around the map?

I take it back, I've got no idea. Every third time it seems to work.

The game seems to be raising up big hills in a square around the spawn point whenever I save and return to the map. Any ideas what's going on there?