I'm getting substantially the same error as before: c:\D2\API\NewClient\EnhancedMessageHandler.h(371) : error C2679: binary '&' : no operator found which takes a right-hand operand of type 'int' (or there is no acceptable conversion) Or, alternatively binary '<<' when using the << operator, in the code: template<class Archive > static void save(Archive & ar, const IplJrsMediaTimePoint& g, const unsigned int version) { ar << ( const int )(g.GetYear()); } - But also when I use static_cast or for type uint32 when I don't have a cast. Any suggestions very gratefully received. Marcin Tustin IT Innovation Centre 2 Venture Road Chilworth Science Park Southampton, SO16 7NP, UK tel: +44 23 8076 0834 fax: +44 23 8076 0833 mailto:mt@it-innovation.soton.ac.uk http://www.it-innovation.soton.ac.uk