i had that option set from the beginning but to no avail. i then tried both "build bsp map" option and the "build simple map" option. the bsp map will load in the engine but no colison on the concave blocks, and the simple map comes back with a "Error E1101 <test.wmb>: Bad WMB format" error and crashes the engine. is there somthing that i could be missing?

thnx again