Snapped the screenshot a split second before it ran out of power... It still burned thru over 6000 EC and 430 rock without any thrust at all. I know that because my orbit didn't change at all... My first test was a far larger ship, (Class E asteroid tug test) with the near future reactor putting out 3000EC/s. Again, no thrust, no orbit change. After redownloading and reinstalling ART (Deleting and then replacing) i did that little bare-bones test ship, which resulted in the screenshot in the previous post. Engine is reporting thrust, but mechjeb disagrees. And the orbit didn't change at all, so i'm reasonably sure mechjeb is correct. My next step would be to see if i can replicate it with a stock install + ART and no other mods... But i am just not in the mood for that tonight. Possibly tomorrow.