My KSP keeps freezing constantly. Always after about 20 minutes of gameplay. It always freezes on the loading screen on vessel recovery, or reverting to launch, or assembly. The only mods I am using are the latest versions of MechJeb2, KW Rocketry, and Kerbal Engineer Redux. I have KSP on Steam, and saw a lot of posts saying that a x64 version would help. However, I am a mac user, and I do not see anything like KSP_x64.exe or KSP_x64.app Also I saw something related to freezing, where you enter -force-gfx-xt into the shortcut options in properties (don't know the name, because I am not a Windows user). It is not a problem related to minimum requirements, because even at lowest graphics, it freezes. It also keeps freezing when I remove mods. I tried Verifying Integrity of Steam Cache, but that only delayed the freeze. At the moment it froze when I went to the Space Center, the KSP.log said this: [LOG 18:22:25.421] Flight State Captured [LOG 18:22:25.421] Saving Achievements Tree... [LOG 18:22:25.421] Saving Achievements Tree... [LOG 18:22:25.422] Saving Achievements Tree... [LOG 18:22:25.422] Saving Achievements Tree... [LOG 18:22:25.465] Game State Saved to saves/John/persistent [LOG 18:22:25.481] [Orbit Targeter]: Target is null [WRN 18:22:25.481] [HighLogic]: =========================== Scene Change : From FLIGHT to SPACECENTER (Async) ===================== [EXC 18:22:25.865] OutOfMemoryException: Out of memory LibNoise.Unity.Generator.VoronoiCached.ConstructCubeArray () LibNoise.Unity.Generator.VoronoiCached..ctor (Double frequency, Double displacement, Int32 seed, Boolean distance) PQSMod_VoronoiCraters.OnSetup () PQS.Mod_OnSetup () PQS.SetupMods () PQS.StartSphere (Boolean force) PQS+.MoveNext () Hardware and Software Specs: OS X 10.9.5 (Mavericks) MacBook Pro 13-inch Mid 2012 2.5 GHz Intel Core i5 - CPU 8 GB 1600 MHz DDR3 - RAM