I used to use these in previous versions and they were great, but in 1.7.10, now they don't seem to show the sky at all, now they just show blue and black with fades, not even the color of the sky in the biome I'm in, I'm just wondering if this is intentional or not? it seems weird to take away such a great feature.

Modded Minecraft takes too long to start

Log:
http://pastebin.com/XaTUX0pR

Standard first guess: Optifine.

Also, are you using any launcher? It's not a problem in itself, but I see some non-standard settings.

I was kinda figuring it was Optifine, but wasn't sure.

Yea, using MultiMC

probably should have asked, but any way to fix it without removing optifine?

Sorry, but no. Optifine does weird, undocumented things.

Have you even wondered, why those two lines are in you crashlog?

Mantle Environment: DO NOT REPORT THIS CRASH! Unsupported mods in environment: optifine
Forestry : Warning: You have mods that change the behavior of Minecraft, ForgeModLoader, and/or Minecraft Forge to your client:
Optifine

Yeah, it's that bad.

oh well, FastCraft is a good enough performance mod that I guess I don't need Optifine

Nope, removed optifine, issue persists

Then maybe try this:

• get Total Commander
• go to mods folder
• open search dialog (alf+f7)
• check "search archives"
• type *.class in "search for"
• check "find text"
• type "glStencilFunc" in box next to it
• "start search"
• look at found jar files

Or just use any other tool that allows you to search through contents of compressed files.

will do that when I get home tonight, but not sure if it will help, Log without Optifine:
http://pastebin.com/bW6EAzrv

And pictures of the issue at hand:

Both pictures taken seconds apart, at the same spot, second picture is 20 block lower, underground with the Inverted Sky blocks

Yeah, that's how it's supposed to look when rendering is broken - it's "fog" color.

Found Jar Mods are:
CodeChickenCore-1.7.10-1.0.7.47-universal.jar/codechicken\core\GuiModListScroll.class
CoFHCore-[1.7.10]3.0.0RC7-211.jar/cofh\lib\gui\element\ElementBase.class
OpenModsLib-1.7.10-0.6.jar/openmods\renderer\StenciledTextureRenderer.class

Then I have no idea...

Guess I'll backup and try uninstalling mods one by one, then let you know what it was

You mean different from MC 1.6? Only method of rendering changed, end effect is still the same (that was forced by similar changes in Minecraft/Forge).

There are two possibilities:

• some other mod interacts with rendering
• you have GPU with poor OpenGL support (i,e, Intel).

I can confirm that this is the issue, I created a new instance with only open blocks, forge and open mod core, and it works fine, any Idea how to find the mod responsible, or how to fix it?

Uh, no idea. Can you trigger crash by holding F3+C ingame for few seconds and then post crashlog here?

Found it, The problem is CoFHcore removing that fixes it, and putting the mod back in, repeats the issue

FIX: Updating to the latest Version of CoFHCore fixes the issue