Ok. I'm not entirely certain how/why it broke, but I've simplified and replaced the formula which calculated the dex penalty for flatfooted and immobile AC for negative dex values and have submitted the fix to GitHub: <a href="https://github.com/Roll20/roll20-character-sheets/" rel="nofollow">https://github.com/Roll20/roll20-character-sheets/</a>... It will be live once the new code is merged and pushed to the servers, probably next week since this is after the merge for this week. Happy Gaming.