z-x64.exe crashes on Windows 8

[sredna]

A bit strange but the first time I run it from Explorer it works fine but after that it always crashes on startup. It works one time if I move it to a different directory. Also crashed when started from cmd.exe.

If I run it in a debugger it does not crash right away but crashes when I press F8 to exit; Access violation - code c0000005.

...
00000001`4002cb88 83c820          or      eax,20h
00000001`4002cb8b 83e860          sub     eax,60h
00000001`4002cb8e 89442420        mov     dword ptr [rsp+20h],eax
00000001`4002cb92 eb1f            jmp     image00000001_40000000+0x2cbb3 (00000001`4002cbb3)
00000001`4002cb94 488d542438      lea     rdx,[rsp+38h]
00000001`4002cb99 b905000000      mov     ecx,5
00000001`4002cb9e ff15e4b50100    call    qword ptr [image00000001_40000000+0x48188 (00000001`40048188)]
00000001`4002cba4 0fbe442438      movsx   eax,byte ptr [rsp+38h]
00000001`4002cba9 83c820          or      eax,20h
00000001`4002cbac 83e860          sub     eax,60h
00000001`4002cbaf 89442420        mov     dword ptr [rsp+20h],eax
00000001`4002cbb3 8b4c2420        mov     ecx,dword ptr [rsp+20h]
00000001`4002cbb7 488d0592910200  lea     rax,[image00000001_40000000+0x55d50 (00000001`40055d50)]
00000001`4002cbbe 0fb70448        movzx   eax,word ptr [rax+rcx*2] ds:00000003`40055d00=????
00000001`4002cbc2 83f87b          cmp     eax,7Bh

This code-path is also executed on startup with eax=7b from rax=140055d50 rcx=a. When it crashes on F8 rcx is ffffffd8.

!analyze -v:

FAULTING_IP: 
image00000001_40000000+2cbbe
00000001`4002cbbe 0fb70448        movzx   eax,word ptr [rax+rcx*2]

EXCEPTION_RECORD:  ffffffffffffffff -- (.exr 0xffffffffffffffff)
ExceptionAddress: 000000014002cbbe (image00000001_40000000+0x000000000002cbbe)
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 0000000000000000
   Parameter[1]: 0000000340055d00
Attempt to read from address 0000000340055d00

FAULTING_THREAD:  0000000000000bd4

DEFAULT_BUCKET_ID:  INVALID_POINTER_READ

PROCESS_NAME:  image00000001`40000000

ERROR_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s.

EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s.

EXCEPTION_PARAMETER1:  0000000000000000

EXCEPTION_PARAMETER2:  0000000340055d00

READ_ADDRESS:  0000000340055d00 

FOLLOWUP_IP: 
image00000001_40000000+2cbbe
00000001`4002cbbe 0fb70448        movzx   eax,word ptr [rax+rcx*2]

MOD_LIST: <ANALYSIS/>

NTGLOBALFLAG:  70

APPLICATION_VERIFIER_FLAGS:  0

PRIMARY_PROBLEM_CLASS:  INVALID_POINTER_READ

BUGCHECK_STR:  APPLICATION_FAULT_INVALID_POINTER_READ

LAST_CONTROL_TRANSFER:  from 000000014002c8c3 to 000000014002cbbe

STACK_TEXT:  
00000000`0013f9a0 00000001`4002c8c3 : 00000001`4005f0e0 00000000`00000000 00000000`00000044 00000000`00000000 : image00000001_40000000+0x2cbbe
00000000`0013fa00 00000001`4002c66f : 00000001`4005f0e0 00000000`00000000 00000000`0013fe40 00000001`4005fb60 : image00000001_40000000+0x2c8c3
00000000`0013fa60 00000001`4002bbaa : 00000001`4005a970 00000000`00000000 0000ff89`35017f8f 00000001`4002f9d5 : image00000001_40000000+0x2c66f
00000000`0013fc00 00000001`4002c7b6 : 00000001`4005a970 00000001`4002c590 00000000`00281856 00000001`4005f0e0 : image00000001_40000000+0x2bbaa
00000000`0013fc50 00000001`4002c875 : 00000000`00281856 00000001`4005f0e0 00000008`01000001 38000003`00000000 : image00000001_40000000+0x2c7b6
00000000`0013fca0 00000001`4001e2d0 : 00000000`00281850 00000001`4005f0e0 00000001`400533a0 00000000`00000000 : image00000001_40000000+0x2c875
00000000`0013fce0 00000001`40025d89 : 00000000`00000000 00000000`0013fd01 00000000`00000000 00009e50`6a90665f : image00000001_40000000+0x1e2d0
00000000`0013fd60 00000001`40025d54 : 00000000`00000007 00000000`00000007 00000000`00000000 00000000`00000000 : image00000001_40000000+0x25d89
00000000`0013fd90 00000001`400259de : 00000000`00000000 00000000`00000007 00000000`ffffffff 00000001`ffffffff : image00000001_40000000+0x25d54
00000000`0013fdc0 00000001`40001e5f : 00000000`00007700 00000000`0013fe20 ffffffff`ffffff00 00000000`0000000e : image00000001_40000000+0x259de
00000000`0013fe00 00000001`40028e52 : 00000001`40053928 00000001`40009a05 00000001`40055770 00000001`00000004 : image00000001_40000000+0x1e5f
00000000`0013fe80 00000001`40028d8c : 00000001`40055770 00000001`400552bf 00000000`00000000 81010101`01010100 : image00000001_40000000+0x28e52
00000000`0013fec0 00000001`40038c1b : 00000000`00000000 00000000`002821a8 00000000`00000000 00000000`00000000 : image00000001_40000000+0x28d8c
00000000`0013ff20 000007f8`7f971832 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : image00000001_40000000+0x38c1b
00000000`0013ff60 000007f8`81ead609 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : KERNEL32!BaseThreadInitThunk+0x1a
00000000`0013ff90 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : ntdll!RtlUserThreadStart+0x1d


MODULE_NAME: Unknown_Module

IMAGE_NAME:  Unknown_Image

DEBUG_FLR_IMAGE_TIMESTAMP:  0

STACK_COMMAND:  ~0s ; kb

BUCKET_ID:  X64_APPLICATION_FAULT_INVALID_POINTER_READ

FAILURE_BUCKET_ID:  INVALID_POINTER_READ_c0000005_Unknown_Image!Unknown

z-x86.exe seems to work fine...