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
Environment
Mac OS X 10.5.8
Model Name: MacBook
Model Identifier: MacBook4,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.1 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 4 GB
Bus Speed: 800 MHz
Boot ROM Version: MB41.00C1.B00
SMC Version (system): 1.31f1
Serial Number (system): W8812BNX0P0
Hardware UUID: 380C5E63-0F16-5514-ACD7-46FEF3F89AA4
Sudden Motion Sensor:
State: Enabled
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?