as a followup:

When i provoke the crash with windbg attached, this is what I get in
WinDbg, but I'm not sure how to best continue debugging this...

[...]
ModLoad: 00000000`66f50000 00000000`66fec000   C:\Program Files (x86)
\Microsoft Visual Studio 9.0\Common7\Packages\Debugger\cpde.dll
(1210.358): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
ffffffff`ff8b0000 ??              ???
0:028:x86> !analyze -v
*******************************************************************************
*                                                                            
*
*                        Exception
Analysis                                   *
*                                                                            
*
*******************************************************************************

***** OS symbols are WRONG. Please fix symbols to do analysis.

***** OS symbols are WRONG. Please fix symbols to do analysis.

*************************************************************************
***                                                                   ***
***                                                                   ***
***    Your debugger is not using the correct symbols                 ***
***                                                                   ***
***    In order for this command to work properly, your symbol path   ***
***    must point to .pdb files that have full type information.      ***
***                                                                   ***
***    Certain .pdb files (such as the public OS symbols) do not      ***
***    contain the required information.  Contact the group that      ***
***    provided you with these symbols if you need this command to    ***
***    work.                                                          ***
***                                                                   ***
***    Type referenced: ntdll!_PEB                                    ***
***                                                                   ***
*************************************************************************

FAULTING_IP:
+ff8b0000
00000000`ff8b0000 ??              ???

EXCEPTION_RECORD:  ffffffffffffffff -- (.exr ffffffffffffffff)
ExceptionAddress: 00000000ff8b0000
  ExceptionCode: c0000005 (Access violation)
 ExceptionFlags: 00000000
NumberParameters: 2
  Parameter[0]: 0000000000000008
  Parameter[1]: 00000000ff8b0000
Attempt to execute non-executable address 00000000ff8b0000

FAULTING_THREAD:  0000000000000358

PROCESS_NAME:  devenv.exe

MODULE_NAME: cpde

FAULTING_MODULE: 0000000076db0000 ntdll

DEBUG_FLR_IMAGE_TIMESTAMP:  48155b0f

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

WRITE_ADDRESS:  00000000ff8b0000

BUGCHECK_STR:  ACCESS_VIOLATION

IP_ON_HEAP:  ffffffffff8b0000
The fault address in not in any loaded module, please check your build's
rebase
log at <releasedir>\bin\build_logs\timebuild\ntrebase.log for module which
may
contain the address if it were loaded.

DEFAULT_BUCKET_ID:  WRONG_SYMBOLS

LAST_CONTROL_TRANSFER:  from 0000000066f73eb2 to ffffffffff8b0000

STACK_TEXT:  
WARNING: Frame IP not in any known module. Following frames may be wrong.
1254f160 66f73eb2 0a3d8c90 6e3d2668 1254f1b0 0xff8b0000
1254f194 6e3d25fa 09376f10 6e3d2668 1254f1b0 cpde!
StaticCPDE::DllGetClassObject+0x142
1254f1b4 6e3d2691 09000414 09376f10 00000000 coloader!VsLoad+0x60
1254f1d0 75ac43b6 07bf0d40 09000414 09376f10 coloader!CVsBothLoader::Load
+0x19
1254f1fc 75b50cc6 6e3d2678 1254f3e0 00000006 RPCRT4!Invoke+0x2a
1254f600 75b51968 095e1c68 096aba20 0926a480 RPCRT4!NdrStubCall2+0x24a
1254f648 768527f7 095e1c68 0926a480 096aba20 RPCRT4!CStdStubBuffer_Invoke
+0x3c
1254f66c 75789759 095e1c68 0926a480 096aba20 OLEAUT32!
CUnivStubWrapper::Invoke+0xc7
1254f6b4 757896f3 0926a480 09074e64 096a7da0 ole32!
WdtpInterfacePointer_UserUnmarshal+0x1dac
1254f700 756a9d67 0926a480 09616520 096a49b0 ole32!
WdtpInterfacePointer_UserUnmarshal+0x1d46
1254f7dc 756a9c5c 096aba20 00000000 096a49b0 ole32!CoRegisterSurrogateEx
+0xf27b
1254f7f8 757887a4 0926a480 00000001 096a49b0 ole32!CoRegisterSurrogateEx
+0xf170
1254f828 75789498 d0908070 096aba20 096a49b0 ole32!
WdtpInterfacePointer_UserUnmarshal+0xdf7
1254f904 75789aa2 0926a428 096a9ad8 00000000 ole32!
WdtpInterfacePointer_UserUnmarshal+0x1aeb
1254f92c 756aa8ea 0926a428 769611e1 09376d80 ole32!
WdtpInterfacePointer_UserUnmarshal+0x20f5
1254f940 7569e086 0926a428 00000000 09376d80 ole32!DcomChannelSetHResult
+0x945
1254f95c 7569e0e2 00000000 00000000 1254f978 ole32!CoRegisterSurrogateEx
+0x359a
1254f96c 769de3f3 09376d80 1254f9b8 76fccfed ole32!CoRegisterSurrogateEx
+0x35f6
1254f978 76fccfed 09376d80 651a6a0f 00000000 KERNEL32!BaseThreadInitThunk
+0xe
1254f9b8 76fcd1ff 7569e0cc 09376d80 00000000 ntdll_76f50000!
__RtlUserThreadStart+0x23
1254f9d0 00000000 7569e0cc 09376d80 00000000 ntdll_76f50000!
_RtlUserThreadStart+0x1b

PRIMARY_PROBLEM_CLASS:  SOFTWARE_NX_FAULT

FOLLOWUP_IP:
cpde!StaticCPDE::DllGetClassObject+142
00000000`66f73eb2 e819d5fdff      call    cpde!_EH_epilog3 (66f513d0)

SYMBOL_STACK_INDEX:  1

SYMBOL_NAME:  cpde!StaticCPDE::DllGetClassObject+142

FOLLOWUP_NAME:  MachineOwner

IMAGE_NAME:  cpde.dll

STACK_COMMAND:  ~28s ; kb

BUCKET_ID:  WRONG_SYMBOLS

Followup: MachineOwner
---------

Thanks for any suggestions!