Obstinate MCP Decompile error

Edit: Okay, so I started to install MC Forge and discovered that it wants a clean minecraft.jar. Devs, feel free to lock this thread. . .

So, I recently fired up MCP with a minecraft.jar + Risugami's modloader combination but can't seem to get the darn thing to decompile right. I keep getting an error -- a method in ContainerFurnace.class keeps getting decompiled as TileEntityFurnace.b(itemstack1), and I can't for the life of me figure out what method is trying to be called -- the only method I can find with the right parameter type and number is marked as private. Has something gone terribly, terrible wrong, or am I just an idiot? (not that both can't be true, of course.) [The only modification to minecraft.jar is Risugami's modloader; MCP decompiles properly without it, but since I'm planning to make an IC2 addon. . .]

I'm using the most recent versions of minecraft (1.2.5) and MCP (6.2), with Risugami's modloader.

Nope, only modloader.

Edit: Okay, I just commented out the relevant portion and the furnace appears to be functioning fine. Odds are there's some arcane combination of shift-clicking, burn time and phase of the moon that the function is supposed to take care of, but I have an interim solution for now.