I have the same problem with all the Unbelievable Shaders v10, except for the Lite version. Other shader packs like Rudo Plays work, and I currently use that because it is pretty good, even though Sonic Ether's packs are probably better.
I think the problem is that we all run OS X, and Sonic Ether said that he doesn't make the shader packs for MAC and that it only works on certain MACs with newer graphics cards.
The only way to die in creative mode, is to mine trough bedrock! My biggest deadly fails: I was checking if obsidian stops TNT but forgot one of the walls... Fell in my own lava trap Built rollercoaster too near my lava pit. And i was too stressed to get out of it. Showed off my diamond block when i scrolled trough inventory on PVP server Tried out my horror house (Click my name if you want to download) Tried to spawn 500 creepers, and now i cant play in that world save... Typed "spawn random 10" and the random mob was enderdragon... Another save ruined Blew up mountain, and me as well LIKE A BOSS