Memory leak in urlmon / mshtml?

I am using Stackwalker to detect memory leaks in my application that
hosts a web browser control. Here is the leak that is occuring a bunch
of times in the application. Does anybody know what might be causing
this or what this could be related to?

Pointer (RequestID): 170699824, Removed: 0, Size: 52
3716: 08/24/07 14:03:46

3716: 0 CMallocSpy::PostAlloc +100 bytes
3716: Decl: CMallocSpy::PostAlloc
3716: Line: ..\stackwalker.cpp(152) +0 bytes
3716: Mod: webshotcmd, base: 00400000h

3716: 1 CoRevokeMallocSpy +325 bytes
3716: Decl: CoRevokeMallocSpy
3716: Mod: ole32, base: 76e70000h

3716: 2 CoTaskMemAlloc +19 bytes
3716: Decl: CoTaskMemAlloc
3716: Mod: ole32, base: 76e70000h

3716: 3 DllCanUnloadNow +79 bytes
3716: Decl: DllCanUnloadNow
3716: Mod: urlmon, base: 77040000h

3716: 4 CoInternetParseIUri +22957 bytes
3716: Decl: CoInternetParseIUri
3716: Mod: urlmon, base: 77040000h

3716: 5 CoInternetParseIUri +17997 bytes
3716: Decl: CoInternetParseIUri
3716: Mod: urlmon, base: 77040000h

3716: 6 CreateUriWithFragment +30 bytes
3716: Decl: CreateUriWithFragment
3716: Mod: urlmon, base: 77040000h

3716: 7 CreateUri +24 bytes
3716: Decl: CreateUri
3716: Mod: urlmon, base: 77040000h

3716: 8 CoInternetCombineUrlEx +89 bytes
3716: Decl: CoInternetCombineUrlEx
3716: Mod: urlmon, base: 77040000h

3716: 9 CoInternetCombineUrl +117 bytes
3716: Decl: CoInternetCombineUrl
3716: Mod: urlmon, base: 77040000h

3716: 10 DllGetClassObject +179693 bytes
3716: Decl: DllGetClassObject
3716: Mod: mshtml, base: 69e90000h

3716: 11 SymGetSymFromAddr(): GetLastError = 126
3716: SymGetLineFromAddr(): GetLastError = 126
3716: SymGetModuleInfo): GetLastError = 126

3716: 12 SymGetSymFromAddr(): GetLastError = 126
3716: SymGetLineFromAddr(): GetLastError = 126
3716: SymGetModuleInfo): GetLastError = 126

3716: 13 SymGetSymFromAddr(): GetLastError = 126
3716: SymGetLineFromAddr(): GetLastError = 126
3716: SymGetModuleInfo): GetLastError = 126

3716: 14 SymGetSymFromAddr(): GetLastError = 126
3716: SymGetLineFromAddr(): GetLastError = 126
3716: SymGetModuleInfo): GetLastError = 126

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