Hi, Just trying to get a comparison going between several different techniques for serialization. After downloading 1.35.0 and using the beautiful auto-installer it was looking pretty good. Trying to compile demo.cpp hasnt gone quite so well; Deleting intermediate files and output files for project 'demo - Win32 Debug'. --------------------Configuration: demo - Win32 Debug-------------------- Compiling... demo.cpp c:\program files\boost\boost_1_35_0\boost\serialization\utility.hpp(50) : error C2989: 'is_bitwise_serializable<struct std::pair<T,`template-parameter258'> >' : template class has already been defined as a non-template class c:\program files\boost\boost_1_35_0\boost\serialization\utility.hpp(50) : error C2988: unrecognizable template declaration/definition c:\program files\boost\boost_1_35_0\boost\aligned_storage.hpp(59) : fatal error C1506: unrecoverable block scoping error Error executing cl.exe. demo.exe - 3 error(s), 0 warning(s) I've searched the mail arachives. There have been a few issues around demo.cpp but they seem unrelated. Anyone know whats going on? Windows XP, Microsoft Visual C++ 2005. Thanks, Scott