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[C++] Weird error

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I'm using Visual Studio 2010 Ultimate. DirectX 9 SDK, also RakNet networking library. But I think these aren't related to the problem. Debugger throws this error:
Unhandled exception at 0x5d59ad4a (msvcp100d.dll) in Server.exe: 0xC0000005: Access violation reading location 0x003493c4.
Error is showed in xutility file, if I track back, calls go through string header, then into my code:
void RPCLogin(RPCParameters *RPC){
	if(GetIndex(RPC->sender.binaryAddress)>=0) return;
	BitStream b(RPC->input, BITS_TO_BYTES(RPC->numberOfBitsOfData), false);
	string acc,pass,file;
	b.ReadCompressed(acc); //if I comment this line, it's all fine
} //shows on this bracket (deconstructor?)
Any ideas what wrong? Or maybe some information missing? Thank you in advance. Edit: If I build in release mode, not debug, there's no error and everything works fine.

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I tried debugging, 'acc' string was right, without any artificials. However if I set value manually, not read from BitStream, there's no error. Any way to identify what's the problem exactly?

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I know nothing about RakNet's BitStream, but from looking at the docs...

From RakNet docs
template<class templateType> bool RakNet::BitStream::ReadCompressed(templateType &var)
Read any integral type from a bitstream.

...I would seriously question whether it is possible to pass something like a std::string to the function. I'd suspect the function internally does something like write_to(&t,sizeof(T),data) which simply won't work for a non-POD type.

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