TFC B75 plank + slab crash

---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 1/27/13 1:42 AM
Description: Ticking memory connection

java.lang.ClassCastException: TFC.TileEntities.TileEntityPartial cannot be cast to TFC.TileEntities.TileEntityWoodConstruct
	at TFC.Items.ItemPlank.a(ItemPlank.java:113)
	at ur.a(SourceFile:88)
	at ir.a(ItemInWorldManager.java:424)
	at iv.a(NetServerHandler.java:578)
	at fk.a(SourceFile:58)
	at cf.b(MemoryConnection.java:80)
	at iv.d(NetServerHandler.java:136)
	at iw.b(NetworkListenThread.java:57)
	at bec.b(IntegratedServerListenThread.java:108)
	at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:702)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:598)
	at bdz.q(IntegratedServer.java:123)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
	at fy.run(SourceFile:849)


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
	Minecraft Version: 1.4.6
	Operating System: Linux (amd64) version 2.6.35.14-106.fc14.x86_64
	Java Version: 1.7.0_10, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 949072936 bytes (905 MB) / 1537015808 bytes (1465 MB) up to 2816737280 bytes (2686 MB)
	JVM Flags: 0 total;
	AABB Pool Size: 1865 (104440 bytes; 0 MB) allocated, 1688 (94528 bytes; 0 MB) used
	Suspicious classes: FML and Forge are installed
	IntCache: cache: 0, tcache: 8737, allocated: 1, tallocated: 31
	FML: MCP v7.25 FML v4.6.15.514 Minecraft Forge 6.5.0.486 4 mods loaded, 4 mods active
	mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
	FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
	Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
	TerraFirmaCraft [TerraFirmaCraft] (TFCraft-Universal-Core-B2-Build75.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 881 (49336 bytes; 0 MB) allocated, 608 (34048 bytes; 0 MB) used
	Player Count: 1 / 8; [iq['mayaknife'/69, l='tf-72', x=728.72, y=150.00, z=-7801.70]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Definitely; Client brand changed to 'forge,fml'