What happens is when I try to play 1.6 or 1.6.2 my screen goes black or white. I can play, but I need to go onto the new launcher, create a new 'Profile' on 1.5.2 and play on that, but I would enjoy using horses and everything new on 1.6
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I see, sorry about that.
Duplicate of MCL-90
LWJGL dropped support for anything below 10.6+
Not Minecraft's issue, either upgrade your OS to 10.6, pray for LWJGL to reintroduce support, or continue to play 1.5.2
Edit: There's still some discussion too and apparently some attempted patches to it, so read through the comments.
Double edit: Someone check my facts, did I link the correct issue?