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URL quoted above parses with no level 1 warning, yet when validating with warning=1 parameter, the list of warnings is correctly empty, but the "warnings" header is still present because the total count of warning (including number of warnings not displayed) is > 0. http://qa-dev.w3.org:8001/css-validator/validator?uri=http%3A%2F%2Fwww.savagecreek.net%2FCSS%2FTest%2F200701%2Ftests%2Ft0703-media-01-b.htm&warning=1
this has been fixed around release on Dec 18 2006.