Ok so I tried recreating the situation minus any mods besides yours. I removed all plugins and dropped in my backup clean "Gamedata" folder, then installed only TAC fuel balancer. I used basically the same craft as before, and tested it on others as well. It appears to happen only when my ship runs out of battery power (not sure if this a planned feature or not, if so I apologize). -I also checked the log file and saw no errors, just mentions of the game loading the assembly "Load(Assembly): TacFuelBalancer/TacFuelBalancer" and "Non platform assembly: C:\Program Files (x86)\Steam\steamapps\common\Kerbal Space Program\GameData\TacFuelBalancer\TacFuelBalancer.dll (this message is harmless)" -There are no errors in the alt-f12 menu, only mention that the module has been loaded and is awake. -It does not crash the game -All files and folders are in the correct locations, and I have re downloaded and installed the mod -Only the option to highlight the tanks remains, no other options regarding the tanks exist