latest 1.8.9 version
I tried to enable logging and MC crashed with the message below.
Will test with a fresher forge and update this is issue if there is any change.
(nope, same crash on forge 1855)

[07:07:34] [Server thread/INFO] [FML/]: The state engine was in incorrect state SERVER_STARTING and forced into state SERVER_STOPPED. Errors may have been discarded.
[07:07:35] [Client thread/INFO] [STDOUT/]: [net.minecraft.init.Bootstrap:func_179870_a:529]: ---- Minecraft Crash Report ----

WARNING: coremods are present:
CCLCorePlugin (CodeChickenLib-1.8-1.1.2.133-universal.jar)
CoreXU2 (extrautils2-1.8.9-alpha-0.0.2.jar)
FMLPlugin (InventoryTweaks-1.60-40.jar)
LoadingPlugin (FastLeaveDecay-1.2.jar)
BiomeTweakerCore (BiomeTweaker-1.8.9-2.1.200.jar)
CoreMod (Aroma1997Core-1.8.9-1.0.4.1.jar)
LoadingPlugin (RandomThings-MC1.8.9-3.6.6.jar)
Contact their authors BEFORE contacting forge

// Don't be sad, have a hug! <3

Time: 2016-04-17 07:07
Description: Exception in server tick loop

java.util.IllegalFormatConversionException: d != net.minecraft.util.EnumFacing
at java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:4302)
at java.util.Formatter$FormatSpecifier.printInteger(Formatter.java:2793)
at java.util.Formatter$FormatSpecifier.print(Formatter.java:2747)
at java.util.Formatter.format(Formatter.java:2520)
at java.util.Formatter.format(Formatter.java:2455)
at java.lang.String.format(String.java:2927)
at org.blockartistry.mod.Restructured.ModLog.debug(ModLog.java:55)
at org.blockartistry.mod.Restructured.world.SchematicWorldGenStructure.prepare(SchematicWorldGenStructure.java:192)
at org.blockartistry.mod.Restructured.world.SchematicWorldGenStructure.build(SchematicWorldGenStructure.java:213)
at org.blockartistry.mod.Restructured.world.SchematicWorldGenHandler.generate(SchematicWorldGenHandler.java:168)
at net.minecraftforge.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:112)
at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:262)
at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1081)
at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:172)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:114)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:84)
at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:307)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:109)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:123)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:441)
at java.lang.Thread.run(Thread.java:745)

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

-- System Details --
Details:
Minecraft Version: 1.8.9
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: 1351695136 bytes (1289 MB) / 2102394880 bytes (2005 MB) up to 3817865216 bytes (3641 MB)
JVM Flags: 4 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4096m -Xms256m -XX:PermSize=256m
IntCache: cache: 15, tcache: 97, allocated: 0, tallocated: 0
FML: MCP 9.19 Powered by Forge 11.15.1.1808 50 mods loaded, 49 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAA mcp{9.19} Minecraft Coder Pack
UCHIJAA FML{8.0.99.99} Forge Mod Loader
UCHIJAA Forge{11.15.1.1808} Minecraft Forge
UCHIJAA Aroma1997Core{${version}} Aroma1997Core
UCHIJAA Aroma1997CoreHelper{1.0.4.1} Aroma1997Core|Helper
UCHIJAA AromaBackup{0.0.1.1.b26} AromaBackup
UCHIJAA AromaBackupRecovery{1.0} AromaBackup Recovery
UCHIJAA bagginses{2.1.5b} Bagginses
UCHIJAA BiomeTweaker{2.1.200} BiomeTweaker
UCHIJAA BiomesOPlenty{3.0.0} Biomes O' Plenty
UCHIJAA bookshelfapi{2.3.7} Bookshelf
UCHIJAA BuildCraft|Core{7.2.5} BuildCraft
UCHIJAA BuildCraft|Silicon{7.2.5} BC Silicon
UCHIJAA BuildCraft|Transport{7.2.5} BC Transport
UCHIJAA BuildCraft|Builders{7.2.5} BC Builders
UCHIJAA BuildCraft|Energy{7.2.5} BC Energy
UCHIJAA BuildCraft|Robotics{7.2.5} BC Robotics
UCHIJAA BuildCraft|Factory{7.2.5} BC Factory
UCHIJAA Chameleon{1.8.9-1.1.2} Chameleon
UCHIJAA ExtraUtils2{1.0} ExtraUtils2
UCHIJAA FastLeaveDecay{1.1} Fast Leave Decay
UCHIJAA FunOres{1.1.3} Fun Ores
UCHIJAA furnus{1.73} Furnus
UCHIJAA gravestone{1.1.3} [Gravestone](Gravestone Mod 1.1.3.jar)
UCHIJAA hammerz{1.8.9-0.1.5.18} Hammerz
UCHIJAA inventorytweaks{1.60-40-e06e29a} Inventory Tweaks
UCHIJAA IronChest{6.0.125.770} Iron Chest
UCHIJAA jacb{1.0.6} JACB
UCHIJAA JEI{2.28.16.184} Just Enough Items
UCHIJAA JEIAddons{0.12.0.57} Just Enough Items Addons
UCHIJAA journeymap{1.8.9-5.1.5} JourneyMap
UCHIJAA jeresources{0.4.0} Just Enough Resources
UCHIJAA LunatriusCore{1.1.2.32} LunatriusCore
UCHIJAA mantle{1.8.9-0.9.2.jenkins102} Mantle
UCHIJAA mcmultipart{1.0.9} MCMultiPart
UCHIJAA tconstruct{1.8.9-2.2.1.jenkins1005} Tinkers' Construct
UCHIJAA neotech{2.4.4} NeoTech
UCHIJAA bonecraft{1.8.9a} [Pam's BoneCraft](Pam's BoneCraft 1.8.9a.jar)
UCHIJAA clayspawn{1.8.9a} [Pam's Clay Spawn](Pam's Clay Spawn 1.8.9a.jar)
UCHIJAA getalltheseeds{1.8.9a} [Pam's Get all the Seeds!](Pam's Get all the Seeds! 1.8.9a.jar)
UCHIJAA simplerecipes{1.8.9a} [Pam's Simple Recipes](Pam's Simple Recipes 1.8.9a.jar)
UCHIJAA progressiveautomation{1.6.35} Progressive Automation
UCHIJAA randomthings{3.6.6} Random Things
UCHIJAA restructured{1.1.0.2BETA} Restructured
UCHIJAA Schematica{1.7.7.143} Schematica
UCHIJAA sem{1.4.5.2} Steam Engines Mod
UCHIJAA semmagie{1.4.5.2} Steam Engines Mod - Magie Addon
UCHIJAA StorageDrawers{1.8.9-2.6.4} Storage Drawers
UCHIJAA villagebox{0.3.0 beta} [Village Box](villagebox-beta 0.3.0.jar)
UD BiomeTweakerCore{2.1.200} BiomeTweaker Core
Loaded coremods (and transformers):
CCLCorePlugin (CodeChickenLib-1.8-1.1.2.133-universal.jar)
codechicken.lib.asm.ClassHeirachyManager
codechicken.lib.asm.RenderHookTransformer
CoreXU2 (extrautils2-1.8.9-alpha-0.0.2.jar)
com.rwtema.extrautils2.asm.ClassTransformerHandler
FMLPlugin (InventoryTweaks-1.60-40.jar)
invtweaks.forge.asm.ContainerTransformer
LoadingPlugin (FastLeaveDecay-1.2.jar)
lumien.fastleavedecay.asm.ClassTransformer
BiomeTweakerCore (BiomeTweaker-1.8.9-2.1.200.jar)
me.superckl.biometweaker.core.BiomeTweakerASMTransformer
CoreMod (Aroma1997Core-1.8.9-1.0.4.1.jar)

LoadingPlugin (RandomThings-MC1.8.9-3.6.6.jar)
lumien.randomthings.asm.ClassTransformer
GL info: ERROR RuntimeException: No OpenGL context found in the current thread.
Pulsar/tconstruct loaded Pulses:
- TinkerCommons (Enabled/Forced)
- TinkerWorld (Enabled/Not Forced)
- TinkerTools (Enabled/Not Forced)
- TinkerGadgets (Enabled/Not Forced)
- TinkerOredict (Enabled/Forced)
- TinkerIntegration (Enabled/Forced)
- TinkerMaterials (Enabled/Forced)
- TinkerDebug (Enabled/Not Forced)

Profiler Position: N/A (disabled)
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

[07:07:35] [Client thread/INFO] [STDOUT/]: [net.minecraft.init.Bootstrap:func_179870_a:529]: #@!@# Game crashed! Crash report saved to: #@!@# C:\Users\oscar\Documents\Curse\Minecraft\Instances\1.8.9 BoP\crash-reports\crash-2016-04-17_07.07.34-server.txt