Broken means that prior toDWORD test = LoadThread_RequestFiles[i];
the vector containes the correct value and has a size of '1'. After this line of code the vector gets a size of '4260741497' and the elements value are just '(...,...,....)'.
Just a shot in the dark, but could you try cleaning and rebuilding the project? I want to say that I've run into this before but I can't remember what it was. I just vaguely remember stepping through the STL code with the debugger.