Black research field, once researched good ?

Black research field, once researched good ?

Well, I'm working on a Hero Arena, I imported icons but the strangest of them is, that when seeing it by research : black, and when researched its the normal icon. Does someone know the problem of this ?
http://img470.imageshack.us/img470/6020/strange9qr.jpg

2 icons imported,
renamed to :
ReplaceableTextures\CommandButtons\BTNPhantomBlade.blp
ReplaceableTextures\CommandButtonsDisabled\DISBTNPhantomBlade.blp

I would correctly check the paths in the object editor, for learning especially!

~Daelin