I have added the alternative texture bug to the V1.009 list. Not sure if you should be able to change textures on static entities however as I am about to create some static batching and light baking code which would make this impossible. Might be easier to transport the player to another level with night-time texturing, or use the lighting LUA commands to create colour changes globally.
PC SPECS: Windows 7 Ultimate 64-bit, Intel Core i7 920 (PASSMARK:5008), NVIDIA Geforce 9600 GT GPU (PASSMARK:752) , 6GB RAM