Try saving your scene just before you batch render. Seems to be a bug in 2011 or at least it is for me. I have autosave on if it autosaves the scene batch render never works untill I manually save the scene and try again.
Sorry i see you already tried that. Best of luck if you work it out let me know. Batch rendering in 2011 has been buggy as hell for me even under SP1
Worst Response To A Crisis:
From a readers' Q and A column in TV GUIDE: "If we get involved in a nuclear war, would the electromagnetic pulses from exploding bombs damage my videotapes?"