[Operating System]: Windows Vista SP2 [Memory]: 3GB [ASAS Trouble (Y/N)]: N but not played much [Mods installed, pre-patch]: N/A, installed fresh [Mods installed, post-patch]: None [Joysticks]: None [Description of problem (keep it short)] On briefly testing with the Aeris 4a and a basic mun rocket of my own design, I can't find anything in particular to complain about. There is an amount of relearning to fly with the new ASAS, but nothing crippling. I found keeping a Mun launcher on a stable gravity turn easier in 0.21. One thing I will say - some people mention mysterious rotation of rockets. I got that in 0.20 and still do in 0.21 It's nothing that cant be corrected for, but there's no obvious cause.