Just as the title says. I haven't played since mid 2014 but I played a whole lot and did most of the advanced things you could do in the game at that time. This morning I installed a bunch of mods, CKAN says no conflicts, and the game loads ok. Memory usage is too high and the game stutters (just like it used to, but even worse) despite my system being ridiculously powerful and with tons of free resources, but I've literally spent all morning trying to launch a basic rocket and nothing works. The rocket fires, goes between 5 and 50 feet, and turns off and falls back to earth. No log errors until it crashes, and it happens in manual mode or with Mechjeb on autopilot. Any idea why this might be happening? I've finally given up trying to figure out why. Fuel lines don't affect it, amount of thrust doesn't affect it, struts don't affect it -- indeed I can't even find out why the engine is turning off.
Also, and this isn't directly related, but what mods are the worst at causing this horrific stuttering? I've got a 4ghz i2500k with 32gb of memory and a watercooled 980ti 6gb heavily OC'd and the game is unplayable like this, even without the settings maxed out and no antialiasing! Crazy!