I load into a world and the chunks are invisible, I have to place a block to get them to all show, I also get horrible lag when loading in new chunks (Before the new update my computer was running it highest settings 60fps with no problems at all)

Also may I suggest:
1. Remove Creative menu starting Items
2. Make the area around a held torch light up
3. Make the recipe book and option and not forced upon us
4. Use the Java creative menu
5. Release shaders for testing