With the AHWiki being down at the moment, I can't verify that I have any of these in my tutorials.
1. Terrain names can not be more than 8 alphanumeric characters long, no spaces, and all in lower case.
2. ALL CV task groups must have a default way point set. If you want a static CV as an object use the "dumcv" shape
and give it a property of VOID, Structure, or Barrier.
3. There is no need to paint textures under any deep ocean water, no one will see it anyway and this will
most definitely increase your terrains .res file size drastically.
4. If your clipboard maps are coming out as an all black image, you did not have the red grid squares checked in the main editor windows option.
5. ALL spawn points must have the "Can Collide" box unchecked. That's Vehicle, Fighter, Bomber, and Boat spawns.
6. Just because something works in offline mode does not mean it will work on HTC's servers.
I'm sure there are others but they escape me at the moment.
edit: I knew I would think of something see number 6 
midi
