sneakpeak said this in the fpsHUD Mod (by Oof) thread, maybe this information will be useful for you:
In windows.xml if you move the code below from "windowCompass" to "HUDLeftStatBars" and reposition the hud elements again, that will get rid of the 'Calling Animator.GotoState on Synchronize layer' error that pops up everytime someone opens a container and seems to create a lot of lag in multiplayer games.