I get a crash at Windows 10, Java 64bit and the latest MFR version for 1.7.10. I don't know whether you still fix bugs for that version. If not, maybe someone else can help me.
I didn't dig into this, but maybe this is related to #393.
But most importantly: thanks for your work on this great mod!
java.lang.NoClassDefFoundError: powercrystals/minefactoryreloaded/world/GrindingWorldServer
at powercrystals.minefactoryreloaded.tile.machine.TileEntityGrinder.func_145834_a(TileEntityGrinder.java:83) ~[TileEntityGrinder.class:?]
at net.minecraft.world.chunk.Chunk.func_150812_a(Chunk.java:873) ~[apx.class:?]
at net.minecraft.world.World.func_147455_a(World.java:2600) ~[ahb.class:?]
at net.minecraft.world.chunk.Chunk.func_150806_e(Chunk.java:851) ~[apx.class:?]
at net.minecraft.world.World.func_147438_o(World.java:2540) ~[ahb.class:?]
at powercrystals.minefactoryreloaded.block.BlockFactoryMachine.getLightOpacity(BlockFactoryMachine.java:86) ~[BlockFactoryMachine.class:?]
at net.minecraft.world.chunk.Chunk.func_150807_a(Chunk.java:631) ~[apx.class:?]
at net.minecraft.world.World.func_147465_d(World.java:451) ~[ahb.class:?]
at net.minecraft.item.ItemBlock.placeBlockAt(ItemBlock.java:206) ~[abh.class:?]
at net.minecraft.item.ItemBlock.func_77648_a(ItemBlock.java:103) ~[abh.class:?]
at net.minecraftforge.common.ForgeHooks.onPlaceItemIntoWorld(ForgeHooks.java:505) ~[ForgeHooks.class:?]
at net.minecraft.item.ItemStack.func_77943_a(ItemStack.java:128) ~[add.class:?]
at net.minecraft.server.management.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:389) ~[mx.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:556) ~[nh.class:?]
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60) ~[jo.class:?]
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9) ~[jo.class:?]
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212) ~[ej.class:?]
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165) ~[nc.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659) ~[MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) ~[MinecraftServer.class:?]
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186) ~[bsx.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [?:?]
Caused by: java.lang.ClassNotFoundException: powercrystals.minefactoryreloaded.world.GrindingWorldServer
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
... 23 more
Caused by: java.lang.NoClassDefFoundError: skyboy/core/world/WorldServerProxy
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_25]
at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[?:1.8.0_25]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_25]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
... 23 more
Caused by: java.lang.ClassNotFoundException: skyboy.core.world.WorldServerProxy
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_25]
at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[?:1.8.0_25]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_25]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
... 23 more
[12:04:22] [Server thread/ERROR]: This crash report has been saved to: crash-2018-02-09_12.04.22-server.txt
[12:04:22] [Server thread/INFO]: Stopping server
[12:04:22] [Server thread/INFO]: Saving players
[12:04:22] [Client thread/INFO]: [net.minecraft.client.Minecraft:func_71377_b:349]: ---- Minecraft Crash Report ----
// Sorry :(
Time: 09.02.18 12:04
Description: Exception in server tick loop
java.lang.NoClassDefFoundError: powercrystals/minefactoryreloaded/world/GrindingWorldServer
at powercrystals.minefactoryreloaded.tile.machine.TileEntityGrinder.func_145834_a(TileEntityGrinder.java:83)
at net.minecraft.world.chunk.Chunk.func_150812_a(Chunk.java:873)
at net.minecraft.world.World.func_147455_a(World.java:2600)
at net.minecraft.world.chunk.Chunk.func_150806_e(Chunk.java:851)
at net.minecraft.world.World.func_147438_o(World.java:2540)
at powercrystals.minefactoryreloaded.block.BlockFactoryMachine.getLightOpacity(BlockFactoryMachine.java:86)
at net.minecraft.world.chunk.Chunk.func_150807_a(Chunk.java:631)
at net.minecraft.world.World.func_147465_d(World.java:451)
at net.minecraft.item.ItemBlock.placeBlockAt(ItemBlock.java:206)
at net.minecraft.item.ItemBlock.func_77648_a(ItemBlock.java:103)
at net.minecraftforge.common.ForgeHooks.onPlaceItemIntoWorld(ForgeHooks.java:505)
at net.minecraft.item.ItemStack.func_77943_a(ItemStack.java:128)
at net.minecraft.server.management.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:389)
at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:556)
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60)
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
Caused by: java.lang.ClassNotFoundException: powercrystals.minefactoryreloaded.world.GrindingWorldServer
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 23 more
Caused by: java.lang.NoClassDefFoundError: skyboy/core/world/WorldServerProxy
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
... 25 more
Caused by: java.lang.ClassNotFoundException: skyboy.core.world.WorldServerProxy
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 29 more
I get a crash at Windows 10, Java 64bit and the latest MFR version for 1.7.10. I don't know whether you still fix bugs for that version. If not, maybe someone else can help me. I didn't dig into this, but maybe this is related to #393. But most importantly: thanks for your work on this great mod!