My install with no other mods CTD about ever 20 - 30 mins or so, Where should I start looking troubleshooting?
Also here is the end of the output_log.txt
========== OUTPUTING STACK TRACE ==================
(0x10107259) (mono): (filename not available): mono_unity_liveness_calculation_end + 0x4e
(0x101072B2) (mono): (filename not available): mono_unity_liveness_calculation_end + 0xa7
(0x101077BF) (mono): (filename not available): mono_unity_liveness_calculation_from_statics + 0x168
(0x0117D406) (KSP): (filename not available): Behaviour::Transfer<SafeBinaryRead> + 0x91986
(0x01190317) (KSP): (filename not available): Behaviour::Transfer<SafeBinaryRead> + 0xa4897
(0x01181579) (KSP): (filename not available): Behaviour::Transfer<SafeBinaryRead> + 0x95af9
(0x01181A44) (KSP): (filename not available): Behaviour::Transfer<SafeBinaryRead> + 0x95fc4
(0x01182BE8) (KSP): (filename not available): Behaviour::Transfer<SafeBinaryRead> + 0x97168
(0x01182D94) (KSP): (filename not available): Behaviour::Transfer<SafeBinaryRead> + 0x97314
(0x011FBD1B) (KSP): (filename not available): Behaviour::Transfer<SafeBinaryRead> + 0x11029b
(0x011FD805) (KSP): (filename not available): Behaviour::Transfer<SafeBinaryRead> + 0x111d85
(0x01470728) (KSP): (filename not available): AnimationEvent::Transfer<StreamedBinaryRead<1> > + 0x123458
(0x014A5610) (KSP): (filename not available): AnimationEvent::Transfer<StreamedBinaryRead<1> > + 0x158340
(0x743A3744) (KERNEL32): (filename not available): BaseThreadInitThunk + 0x24
(0x772B9CD4) (ntdll): (filename not available): RtlSetCurrentTransaction + 0xd4
(0x772B9C9F) (ntdll): (filename not available): RtlSetCurrentTransaction + 0x9f
========== END OF STACKTRACE ===========
**** Crash! ****
Here is the top of the error.log
Unity Player [version: Unity 4.6.4f1_99f88340878d]
mono.dll caused an Access Violation (0xc0000005)
in module mono.dll at 0023:10107259.
Error occurred at 2015-12-29_195824.
E:\Program Files (x86)\Steam\steamapps\common\Kerbal Space Program\KSP.exe, run by WALLACE989.
41% memory in use.
0 MB physical memory [0 MB free].
0 MB paging file [0 MB free].
0 MB user address space [105 MB free].
Write to location 00000000 caused an access violation.
Context:
EDI: 0x00000001 ESI: 0xf6ed6668 EAX: 0x00000000
EBX: 0xf6c22b30 ECX: 0x00000000 EDX: 0x47ee1230
EIP: 0x10107259 EBP: 0x0060f3dc SegCs: 0x00000023
EFlags: 0x00210246 ESP: 0x0060f3d8 SegSs: 0x0000002b