Hires texture not working?

[aaronlite]

Okay, I have switched the texture and loaded a texture into a game, but I tried doubling the image resolution, and it won't load into the game...

Is there some kind of rule you have to follow for a higher res texture to work, or can we only swap textures for the same size texture for now...?

Oh, and does anybody know if someone is starting any texture projects?