MAJOR editor problem!

[Khan]

Help! My floors wont stay up! everytime I try to place a floor, I save, go in game to check, and they just, fall, into blackness, Ive used the materials floor, and eve tried placing the static objects 1 by 1, and they still fell, WTF, plox help!

[Kyle]

Did you make sure that, when the plane/floor is selected, collision is on? If it is and there it doesn't work, delete your .map_cache file for that map.

[Khan]

thank you!