locks up when I am building

[NutCase]

ok so I pretty much have a room with lights, and it built fine, then I put in a weapon base, and ammo pick up and when I went to build it locked up at the Undefining stage and shuts down. I tried it with out the weapon base and with the ammo and it built fine, but as soon as I put in the weapon base it did the same thing, locking up at the Undefining stage. Help I want to try to make a full level

[Lord_Simeon]

You need the editor patch.
It over writes the engine.dll

Otherwise, whenever you rebuild paths, it will crash
The link is on UP's front page

[Lord_Simeon]

bah, i was going to attach it but its 1.2 Mg