Direwolf20 v 1.0.7
Minecraft 1.6.4

Forge Mod Loader 6.4.45.953
Minecraft Forge 9.11.1.953
Thermal Expansion 3.0.0.b10a
OpenBlocks 1.2.2

Crash Log
http://pastebin.com/jnf60SDU

Problem: Game crash when Auto-Anvil attemps to auto-drink from connected Fluiduct that contains liquid xp juice.

Steps to Reproduce:

Summary:

1. Get xp juice into a fluiduct
2. attach Auto-Anvil and set it to auto-drink from the Fluiduct

Example:

1. Place Drum of XP Juice (Extra Utilities)
2. Place Fluiduct below (Thermal Expansion)
3. Place Auto-Anvil (OpenBlocks) adjacent to Fluiduct
4. Configure the Auto-Anvil.. right click it and click the bucket icon in the tabbed menu to the right. Check the auto-drink box and select the side that corresponds to the Fluiduct

Get xp juice into the Fluiduct...

1. Get a Pneumatic Servo. While holding it, right click the end of the Fluiduct that connects to the XP Drum, you should see a message saying that it was installed
2. With the Crescent Hammer, right click once on the same end of the Fluiduct. It should show a red arrow pointing away from the XP Drum

http://i.imgur.com/sanepsR.png
ExtraUtilities Drum (xp juice)
Thermal Expansion Fluiduct w/ Pneumatic Servo installed
OpenBlocks Tank
OpenBlocks Auto-Anvil (set to auto-drink from tank side)
WORKS FINE, NO PROBLEM

http://i.imgur.com/g6jpXIw.png
ExtraUtilities Drum (xp juice)
Thermal Expansion Fluiduct w/ Pneumatic Servo installed
OpenBlocks Auto-Anvil

If the Auto-Anvil is set to auto-drink from the Fluiduct, as soon as xp juice enters the Fluiduct the game will crash. So either setting auto-drink first then allowing xp juice into the Fluiduct OR vice versa will cause the crash.

It must have something to do with the TE Fluiducts and Auto-Anvil. I know TE recently changed something with their ducts but I don't know the details of that.

Cheers, thanks for your work on this mod.

This is a Forge Multipart bug and has already been reported to them. Cheers

Apologies for the short reply. Travelling home and in the car! :)