I don't suppose anyone can give me any pointers onto what the
following could mean? Internet Explorer 6 is crashing every now and
again when performing complex DOM manipulation

call stack:
--------------

    mshtml.dll!CLayout::Doc()  + 0xd bytes
    mshtml.dll!CLayout::GetLookasidePtr()  + 0x28 bytes
    mshtml.dll!CLayout::FlushRequest()  + 0x12 bytes
    mshtml.dll!CRequest::RemoveFromLayouts()  + 0x15 bytes
    mshtml.dll!CElement::ExitTree()  + 0xba11 bytes
    mshtml.dll!CElement::Notify()  + 0x915 bytes
    mshtml.dll!CSpliceTreeEngine::RemoveSplice()  + 0xe09e3 bytes
    mshtml.dll!CMarkup::SpliceTreeInternal()  + 0x89 bytes
    mshtml.dll!CDoc::CutCopyMove()  + 0xa6 bytes
    mshtml.dll!CDoc::Move()  + 0x18 bytes
    mshtml.dll!CDocument::get_implementation()  - 0x6e560 bytes
    mshtml.dll!CElement::insertBefore()  + 0xc0 bytes
    mshtml.dll!Method_IDispatchpp_IDispatchp_o0oVARIANT()  + 0x84 bytes
    mshtml.dll!CBase::ContextInvokeEx()  + 0x154 bytes
    mshtml.dll!CElement::ContextInvokeEx()  + 0x49 bytes
    mshtml.dll!CElement::ContextThunk_InvokeEx()  + 0x43 bytes
    jscript.dll!IDispatchExInvokeEx2()  + 0x6c bytes

etc etc

disassembly:
------------------

CLayout::Doc:
7FAE6F51 F6 41 17 01      test        byte ptr [ecx+17h],1
7FAE6F55 8B 41 04         mov         eax,dword ptr [ecx+4]
7FAE6F58 0F 84 92 B4 F8 FF je          CLayout::Doc+18h (7FA723F0h)
7FAE6F5E 8B 40 50         mov         eax,dword ptr [eax+50h]
7FAE6F61 33 C9            xor         ecx,ecx
7FAE6F63 85 C0            test        eax,eax
7FAE6F65 74 03            je          CLayout::Doc+15h (7FAE6F6Ah)
7FAE6F67 8B 48 0C         mov         ecx,dword ptr [eax+0Ch]
7FAE6F6A 8B C1            mov         eax,ecx
7FAE6F6C C3               ret
7FAE6F6D 90               nop
7FAE6F6E 90               nop
7FAE6F6F 90               nop
7FAE6F70 90               nop
7FAE6F71 90               nop

Any thoughts would be much appreciated, issue has been driving me nuts
Regards,
Andrew