Grill doesn't work in multiplayer: neither sausages nor kebabs can be placed on it. And it also cannot be destroyed: I get the breaking animation after one hit, but the block stays there invisible and re-appears after right clicking, relogging or chunk reloading.
When I right click with Spatula on a Grill I get this error in my server's log:

[07:17:07] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NoSuchFieldError: leftFlipCount
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_05]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_05]
at net.minecraft.util.Util.func_181617_a(SourceFile:45) [g.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:660) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:344) [ko.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:605) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:481) [MinecraftServer.class:?]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_05]
Caused by: java.lang.NoSuchFieldError: leftFlipCount
at com.mrcrayfish.furniture.tileentity.TileEntityGrill.(TileEntityGrill.java:44) ~[TileEntityGrill.class:?]
at com.mrcrayfish.furniture.blocks.BlockGrill.func_149915_a(BlockGrill.java:121) ~[BlockGrill.class:?]
at net.minecraft.block.Block.createTileEntity(Block.java:1309) ~[afh.class:?]
at net.minecraft.world.chunk.Chunk.func_177422_i(Chunk.java:831) ~[amy.class:?]
at net.minecraft.world.chunk.Chunk.func_177424_a(Chunk.java:848) ~[amy.class:?]
at net.minecraft.world.World.func_175625_s(World.java:2295) ~[adm.class:?]
at com.mrcrayfish.furniture.blocks.BlockGrill.func_180639_a(BlockGrill.java:71) ~[BlockGrill.class:?]
at net.minecraft.server.management.ItemInWorldManager.func_180236_a(ItemInWorldManager.java:427) ~[lg.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:588) ~[lm.class:?]
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:59) ~[ja.class:?]
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:10) ~[ja.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[fh$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_05]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_05]
at net.minecraft.util.Util.func_181617_a(SourceFile:44) ~[g.class:?]
... 5 more

Thanks for the report. Fixed th NoSuchFieldError in 4f6f643 and fixed not being able to place sausages and kebab in 2a254f9. Hardness was also fixed for all blocks in ce5dd1c so it doesn't break instantly. I couldn't replicate the reappearing block after break.