There seems to be a bug in the fibonacci random generators. Only the smaller lagged_fibonacci generators work. Code Sample (tested with VC7.1) follows. The debugger says: Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention. //lagged_fibonacci4423 and smaller works, //>=9689 fails typedef boost::lagged_fibonacci9689 rng_type; rng_type rng; rng.seed((unsigned)time( NULL )); boost::uniform_int uni(0,len-1); //crashes on this line. boost::variate_generator > die(rng, uni);