Hi, When I run the following program it runs successfully but throws an exception during shutdown. I don't know why, but it seems that the call to boost::filesystem::file_size() is corrupting memory somehow. This example only shows the call to file_size() but I think I've seen similar trouble with other calls within boost::filesystem. Am I doing something wrong here or is this a bug? Regards, Jason Aubrey ---------------------- Environment: OS: Win2k Compiler: VS7.1 Boost: v1.33.1 ---------------------- #include <boost/filesystem/operations.hpp> #include <fstream> int main(int, char**) { // Create a file using namespace std; const string fileName("/temp/test.txt"); ofstream file; file.open(fileName.c_str()); const string message("this is a test"); file << message; file.close(); const boost::intmax_t fileSize = boost::filesystem::file_size(fileName); if( fileSize != message.size() ) throw std::exception("Bad result"); return 0; } ---------------------- The following pop-up occurs during program completion: Window Title="Microsoft Visual C++ Debug Library" Window Icon=Critical Error Window Text=" Debug Assertion Failed! Program: .... File: dbgdel.cpp Line: 52 Expression: _BLOCK_TYPE_IS_VALID(pHead->nBlockUse) For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts. (Press Retry to debug the application)" Buttons=[Abort] [Retry] [Ignore]