OpenGL backend Errors/Crash in build 4.0-428 onwards

Last working build for me is 4.0-427. No errors, game boots. 4.0-428 onwards I get "Failed to compile pixel shader" errors. Recent Dolphin builds just crashes. D3D backend working fine.

Not all games affected.
Working:
Donkey Kong Country Returns
Killer 7
Mario Kart Wii
Muramasa
NSMBW
Pandora's Tower
Project Zero 2
Star Fox Adventures
Star Fox: Assault
The Last Story
Legend of Zelda: Ocarina of Time
Xenoblade Chronicles

Not working:
Baten Kaitos 1+2
Dead Space Ex
LotR Return of the King
Prince of Persia: Warrior Within
Project Zero 4
Wii Sports Resort