not showing on Unity Build Android..!

I have a problem when I build my game for Android where a set of images I turn on in script appear invisible. I know they are there because their actions when pressed still occur, but there are not visible. This problem though only occurs when building to Android. It works fine when I play in the editor in both PC and Android and works fine when I build to PC. I have gone over what seems to be everything that could make it my fault and I don't see how to fix this problem. I really need to this to work otherwise my Android version of the game is unplayable. Thanks.