There are some fresh statechart failures: http://tinyurl.com/wsdcj The seem to be related to my change to Boost.Build, that makes it (correctly) set threading=multi on msvc, on the grounds that it always uses multi-threading with shared runtime. The comments in libs/statechart/test/Jamfile.v2 say: # Some platforms have either problems with the automatic detection of the # threading mode (e.g. vc-7_1 & gcc >= 3.4.0) or don't support single- # threaded mode (e.g. vc-8_0). We therefore manually turn MT off here local st-requirements = <define>BOOST_DISABLE_THREADS ; for local cpp-source in $(cpp-sources) { obj $(name)$(cpp-source) : $(cpp-source).cpp : <threading>single:$(st-requirements) $(requirements) ; objs += $(name)$(cpp-source) ; } I think the right fix *might be* changing <threading>single above to <threading>multi, *or* adding <threading>multi:$(st-requirements) or making $(st-requirements) unconditional. Unfortunately, I'm not sure which one is right, and the comment above does not help me. Can the library authors look into this and adjust the Jamfile as needed? Thanks, Volodya