I was going to try some 1.4 parts in custom maps, yep it was a real problem. The map sillouets loaded, flashed pink and dissappeared. The colliders were OK. I tested it on Round World and KrazyWurld. This issue, I think, is caused by game engine update.
the two maps doesent work in 1.4 but the try the map mach loop i used thid work fine