I've isolated the problem to Optifine. Currently, the 1.11.2 version (Every variation available on their website) of Optifine causes worlds to not load. With any other mod or mod combination I've used, the game starts up fine, the worlds load fine, the game itself runs well. Anytime I put Optifine into the mix, the game starts up fine, I can use the shaders or resource packs I want, but the moment I try to open up any of my worlds, with or without shaders, with or without resource packs, with or without other mods, the game crashes before the world loads. Here's my most recent crash log with no other mods and "Internal" shaders on. The world was pre-loaded in vanilla Minecraft outside of Forge.

 

Spoiler

---- Minecraft Crash Report ----

WARNING: coremods are present:
Contact their authors BEFORE contacting forge

// Would you like a cupcake?

Time: 5/17/17 5:18 PM
Description: Ticking block entity

java.lang.NoSuchMethodError: net.minecraft.profiler.Profiler.startSection(Ljava/lang/Class;)V
    at net.minecraft.world.World.func_72939_s(World.java:1801)
    at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:621)
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:720)
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:624)
    at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:240)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482)
    at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Server thread
Stacktrace:
    at net.minecraft.world.World.func_72939_s(World.java:1801)

-- Block entity being ticked --
Details:
    Name: minecraft:mob_spawner // net.minecraft.tileentity.TileEntityMobSpawner
    Block type: ID #52 (tile.mobSpawner // net.minecraft.block.BlockMobSpawner)
    Block data value: 0 / 0x0 / 0b0000
    Block location: World: (492,23,-247), Chunk: (at 12,1,9 in 30,-16; contains blocks 480,0,-256 to 495,255,-241), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
    Actual block type: ID #52 (tile.mobSpawner // net.minecraft.block.BlockMobSpawner)
    Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
    at net.minecraft.world.World.func_72939_s(World.java:1801)
    at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:621)

-- Affected level --
Details:
    Level name: Lexie
    All players: 0 total; []
    Chunk stats: ServerChunkCache: 625 Drop: 0
    Level seed: 8832862238652467835
    Level generator: ID 00 - default, ver 1. Features enabled: true
    Level generator options: 
    Level spawn location: World: (687,64,-434), Chunk: (at 15,4,14 in 42,-28; contains blocks 672,0,-448 to 687,255,-433), Region: (1,-1; contains chunks 32,-32 to 63,-1, blocks 512,0,-512 to 1023,255,-1)
    Level time: 3137 game time, 3137 day time
    Level dimension: 0
    Level storage version: 0x04ABD - Anvil
    Level weather: Rain time: 64125 (now: false), thunder time: 140436 (now: false)
    Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:720)
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:624)
    at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:240)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482)
    at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
    Minecraft Version: 1.11.2
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_25, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 596542376 bytes (568 MB) / 874504192 bytes (833 MB) up to 3207856128 bytes (3059 MB)
    JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
    IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
    FML: MCP 9.38 Powered by Forge 13.20.0.2298 Optifine OptiFine_1.11.2_HD_U_B7 5 mods loaded, 5 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
    UCHIJAAAAAA    minecraft{1.11.2} [Minecraft] (minecraft.jar) 
    UCHIJAAAAAA    mcp{9.19} [Minecraft Coder Pack] (minecraft.jar) 
    UCHIJAAAAAA    FML{8.0.99.99} [Forge Mod Loader] (forge-1.11.2-13.20.0.2298.jar) 
    UCHIJAAAAAA    forge{13.20.0.2298} [Minecraft Forge] (forge-1.11.2-13.20.0.2298.jar) 
    UCHIJAAAAAA    mercurius_updater{1.0} [mercurius_updater] (MercuriusUpdater-1.11.2.jar) 
    Loaded coremods (and transformers): 
    Profiler Position: N/A (disabled)
    Player Count: 0 / 8; []
    Type: Integrated Server (map_client.txt)
    Is Modded: Definitely; Client brand changed to 'fml,forge'
    OptiFine Version: OptiFine_1.11.2_HD_U_B7
    Render Distance Chunks: 9
    Mipmaps: 4
    Anisotropic Filtering: 1
    Antialiasing: 0
    Multitexture: false
    Shaders: (internal)
    OpenGlVersion: 4.4.0 - Build 21.20.16.4550
    OpenGlRenderer: Intel(R) HD Graphics 520
    OpenGlVendor: Intel
    CpuCount: 4

 

 

We know, bug optifine to update.