Excuse my insistence, but I have no other way to try to fix current regressions in Boost.MultiIndex but to ask for external support. So I'm reposting my plea for help: Hello, Most current tests for Boost.MultiIndex under CW 8.3 in Windows fail at run time with the following: Running 1 test case... unknown location(0): fatal error in "test_main_caller( argc, argv )": unknown type *** 1 failure detected in test suite "Test Program" EXIT STATUS: 201 (see for instance http://tinyurl.com/fqarz), compilation and building having gone fine. As this is giving very little info, I'd be grateful if someone with local access to CW 8.3 Windows (it is likely that Mac will also do) volunteer to do some exploration of the problem. If you are such volunteer, please contact me privately. Thank you very much, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo