I've got a weird problem with engines.
Sorry if this has been brought up already - the thread is long and I got all blurry-eyed while trying to read through it..
Both the arerospike and vaccuum bell engines are totally awesome for interstellar travel, but every now and then weird thing happens - the engine's reactor (not the engine itself) starts consuming a HUGE amounts or fuel. A "whole tank gone in five seconds" huge.
When it happened for the first time I managed to fix it by reloading, but since then it's a show stopper, the only way to get rid of it is to terminate the mission and start over. Which kind of sucks when I'm two R/L das into a mission (I don't use the warp mode, so burns take hours)
Has anybody encountered this or is it some local issue (a mod conflict, probably, although I did take care and don't use any with known conflicts)
Also, as a side note (and probably also something mentioned here before (sorry)), the aerospike engine is not in the tech tree so it's missing from science/carreer modes.