More annoying noobie questions.

1. I have placed several props from the commmon ODF in my level. They appear along with everything else in the editor. When I play the level, the turrets show up fine but the props don't appear.

2. Whenever I try to place a prop from a shipped level, I get an eror saying that it could not find/open the specified ODF/MSH.

Any help would be greatly appreciated.