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If I validate http://www.crashonline.org.uk/yui/build/grids/grids.css with Unicorn, then some CSS errors are listed, but only one actually tells me what the error is, the others just show the location of the error. http://qa-dev.w3.org/unicorn/observe?ucn_task=conformance&ucn_uri=http%3A%2F%2Fwww.crashonline.org.uk%2Fyui%2Fbuild%2Fgrids%2Fgrids.css "# Error Line 13 : #doc # Error Line 19 : #bd # Error Line 64 : .yui-gb .yui-u, .yui-gc .yui-u, .yui-gd .yui-u" etc. The CSS validator itself correctly shows the errors. http://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Fwww.crashonline.org.uk%2Fyui%2Fbuild%2Fgrids%2Fgrids.css&usermedium=all "# Line: 13 Context : #doc Parse Error - *width:56.3em; # Line: 19 Context : #bd Parse Error - :750px; margin:auto; text-align:left; } #hd " etc.
http://qa-dev.w3.org:8001/css-validator/validator?uri=http%3A%2F%2Fwww.crashonline.org.uk%2Fyui%2Fbuild%2Fgrids%2Fgrids.css&warning=1&profile=css2&usermedium=all&output=ucn shows that this is not a bug in Unicorn but in the CSS Validator output.
moving bug to proper product
Fixed by Julien in CVS.