Finally trying out 1.34, and had 1 problem so far using current cvs for RC_1_34_0. For this code: retval = boost::io::str( //line 424 boost::format("%s%4.1f/%s%4.1f") % tests[0].from_lm % tests[0].from_offset % tests[0].to_lm % tests[0].to_offset ); with those members accessed being: char from_lm[16]; float from_offset; char to_lm[16]; float to_offset; I got the attached compiler errors from VS 2005 (no SP1). I fixed it with the changes below, but I haven't been able to test the execution yet, I assume it will work fine. I probably could have fixed it by converting from_lm and to_lm to std::strings on the way in, but the <size_type> seemed more correct. This would be a regression from my previous 1.32.1 boost. I'm pretty surprised surprised so far, Boost upgrades usually aren't this painless, though I've got another 6 hours of compiling to do. Not to mention the other platforms. Index: boost/format/feed_args.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/format/feed_args.hpp,v retrieving revision 1.28.6.2 diff -u -w -r1.28.6.2 feed_args.hpp --- boost/format/feed_args.hpp 19 Jun 2006 06:15:12 -0000 1.28.6.2 +++ boost/format/feed_args.hpp 16 Feb 2007 23:09:12 -0000 @@ -156,7 +156,7 @@ if(buf.pcount()== 0 || (res_beg[0] !=oss.widen('+') && res_beg[0] !=oss.widen('-') )) prefix_space = oss.widen(' '); - size_type res_size = (std::min)( + size_type res_size = std::min<size_type>( static_cast<size_type>(specs.truncate_ - !!prefix_space), buf.pcount() ); mk_str(res, res_beg, res_size, w, oss.fill(), fl, @@ -201,7 +201,7 @@ } // we now have the minimal-length output const Ch * tmp_beg = buf.pbase(); - size_type tmp_size = (std::min)(static_cast<size_type>(specs.truncate_), + size_type tmp_size = std::min<size_type>(static_cast<size_type>(specs.truncate_), buf.pcount() );