corrupted player data while recovering from crash

[AnAwesomGuy]

looks like this might be caused by #14?
so i joined the singleplayer world, and got this in the logs (twice), which kicked me back to the main menu screen instantly. (no crash screen or anything)

[Netty Client IO #2/ERROR] [FML]: NetworkDispatcher exception
java.lang.RuntimeException: Timeout waiting for client thread to catch up!
	at cpw.mods.fml.client.FMLClientHandler.waitForPlayClient(FMLClientHandler.java:877)
	at cpw.mods.fml.common.FMLCommonHandler.waitForPlayClient(FMLCommonHandler.java:585)
	at cpw.mods.fml.common.network.handshake.NetworkDispatcher.clientListenForServerHandshake(NetworkDispatcher.java:171)
	at cpw.mods.fml.common.network.handshake.FMLHandshakeClientState$1.accept(FMLHandshakeClientState.java:35)
	at cpw.mods.fml.common.network.handshake.FMLHandshakeClientState$1.accept(FMLHandshakeClientState.java:29)
	at cpw.mods.fml.common.network.handshake.HandshakeMessageHandler.userEventTriggered(HandshakeMessageHandler.java:40)
	at io.netty.channel.DefaultChannelHandlerContext.invokeUserEventTriggered(DefaultChannelHandlerContext.java:308)
	at io.netty.channel.DefaultChannelHandlerContext.fireUserEventTriggered(DefaultChannelHandlerContext.java:294)
	at io.netty.channel.ChannelInboundHandlerAdapter.userEventTriggered(ChannelInboundHandlerAdapter.java:108)
	at io.netty.channel.DefaultChannelHandlerContext.invokeUserEventTriggered(DefaultChannelHandlerContext.java:308)
	at io.netty.channel.DefaultChannelHandlerContext.fireUserEventTriggered(DefaultChannelHandlerContext.java:294)
	at io.netty.channel.ChannelInboundHandlerAdapter.userEventTriggered(ChannelInboundHandlerAdapter.java:108)
	at io.netty.channel.DefaultChannelHandlerContext.invokeUserEventTriggered(DefaultChannelHandlerContext.java:308)
	at io.netty.channel.DefaultChannelHandlerContext.fireUserEventTriggered(DefaultChannelHandlerContext.java:294)
	at io.netty.channel.DefaultChannelPipeline.fireUserEventTriggered(DefaultChannelPipeline.java:779)
	at cpw.mods.fml.common.network.handshake.NetworkDispatcher.handlerAdded(NetworkDispatcher.java:137)
	at io.netty.channel.DefaultChannelPipeline.callHandlerAdded0(DefaultChannelPipeline.java:484)
	at io.netty.channel.DefaultChannelPipeline.callHandlerAdded(DefaultChannelPipeline.java:479)
	at io.netty.channel.DefaultChannelPipeline.addBefore0(DefaultChannelPipeline.java:178)
	at io.netty.channel.DefaultChannelPipeline.addBefore(DefaultChannelPipeline.java:163)
	at io.netty.channel.DefaultChannelPipeline.addBefore(DefaultChannelPipeline.java:153)
	at cpw.mods.fml.common.network.handshake.NetworkDispatcher.insertIntoChannel(NetworkDispatcher.java:124)
	at cpw.mods.fml.common.network.handshake.NetworkDispatcher.clientToServerHandshake(NetworkDispatcher.java:129)
	at cpw.mods.fml.common.network.internal.FMLNetworkHandler.fmlClientHandshake(FMLNetworkHandler.java:66)
	at net.minecraft.client.network.NetHandlerLoginClient.func_147390_a(NetHandlerLoginClient.java:107)
	at net.minecraft.network.login.server.S02PacketLoginSuccess.func_148833_a(SourceFile:39)
	at net.minecraft.network.login.server.S02PacketLoginSuccess.func_148833_a(SourceFile:11)
	at net.minecraft.network.NetworkManager.channelRead0(NetworkManager.java:113)
	at net.minecraft.network.NetworkManager.channelRead0(NetworkManager.java:317)
	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:98)
	at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337)
	at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785)
	at io.netty.channel.local.LocalChannel.finishPeerRead(LocalChannel.java:313)
	at io.netty.channel.local.LocalChannel.access$400(LocalChannel.java:43)
	at io.netty.channel.local.LocalChannel$6.run(LocalChannel.java:299)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:354)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:348)
	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101)
	at java.lang.Thread.run(Thread.java:750)

after that, i rejoined the world, which worked, but my playerdata was cleared (reset to nothing)

note that earlier, i had been kicked to the server screen from a network error by storage drawers. after that, i rejoined the world, played as normal for a while, and quit and suspended the process so i didnt have to restart it.

tested in a modified version of regrowth (with performance mods: falsetweaks, falsepatternlib, unimixins, bugtorch, smoothfont, entity culling, leaf culling, fps reducer, coretweaks, and neodymium)
fml-client-latest.log