Similar problem, I downloaded both aggressive and basic to be thorough, both cause *just the game to freeze* after it loads nine or ten items. I haven't tried uninstalling KAS yet so it may be that, it is the only mod on our lists that are the same. I'm also running latest Windows 8 (yuck...) with 8 gigs of ram. I've got plenty of mods but all of them are listed as compatible (B9, Visuals, KSPI, Firespitter, KW, DeRe, FAR, Pwings, KAS, KerbEnigineer, Toolbar and TAC). Edit: Removed KAS and problem persists. I don't believe it is that mods fault. To be a bit more specific, after a couple of items load the screen freezes and the program stops responding. I can close it by clicking exit in non-fullscreen mode or by using Ctrl+Alt+Del. It is not harming my game in any way, I'm installing this for the first time. I just want the performance boost Edit 2: For people having issues, try downloading basic after installing KW reduced pack. This actually did fix the problem, no idea why.