First of all, thank you Ferram and everyone else for your amazing work on this plugin. FAR takes KSP from a fun little game to the highest plateaus of time-suck However, I've been getting bugged by a little bug (haha) that I haven't seen reported anywhere in this thread. Occasionally, when tweaking a spaceplane design involving the Mk2 cargobay I will find that the center of lift will become unbalanced to the left or right. This causes the plane to go into a constant roll on launch. It only seems to come up when optimizing the Mach 1 Wave drag-area below approximately 2.5. I have tested this on a clean install with only FAR installed (dev version 3a0b0b5987) and I've built an example craft that displays this behavior. This plane will roll constantly to the right on launch, until you raise the gear. Then it flies perfectly level. However, on my main install I have been able to build craft that do this with gear up or down. Here is a link to the craft file and my output log. https://drive.google.com/folderview?id=0B90Kqpp-VQCqfm11TWo1U3Zoc3QtMVB0M2FGbHdrdmU5VWF4QjNSTUszVlh2RzNlRVl6Tmc&usp=sharing Thank you again for doing such great work.