Hi, I'm getting a runtime check error from MSVC8 in the following code checked out from cvs_head: serialization/collections_load_imp.hpp line 116 ... template<class Archive, class Container, class InputFunction, class R> inline void load_collection(Archive & ar, Container &s) { s.clear(); // retrieve number of elements unsigned int count; unsigned int item_version; ar >> BOOST_SERIALIZATION_NVP(count); if(3 < ar.get_library_version()){ ar >> BOOST_SERIALIZATION_NVP(item_version); } R rx; rx(s, count); InputFunction ifunc; while(count-- > 0){ ifunc(ar, s, item_version); } } ... The debugger breaks every time ifunc() is called which is frustrating to say the least. If load_collection() is wrapped with #pragma runtime_checks( "u", off ) ... #pragma runtime_checks( "u", restore ) it doesn't help - perhaps I've rebuilt it incorrectly, perhaps the pragma needs to be around where the code is instantiated. I managed to get around the problem by assigning 0 to item_version. Has anyone specifically chosen to turn runtime checks on for debug builds with MSVC8 or is this just the default? Thanks, John.