boost mutex C++/CLI problems

I'm developing in Visual Studio 2008 C# for 64bit and I want to use to use a library which uses boost. So I wrote a wrapper in C++/CLI. I managed to target the error I get to

#include <boost/thread/mutex.hpp>.

If I include any file in my C++/CLI wrapper that by itself includes or if I include it directly in the wrapper I get a "System.AccessViolationException" "Attempted to read or write protected memory. This is often an indication that other memory is corrupt."

I was very carefull in building everything for 64bit so I doubt that the problems is there. When I use the same library in 64 bit in "plain" C++ everything works fine. I came over a couple of posts where people seem to have similar problems with boost threads but none of the solutions I found worked. Does anyone have an idea?