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http://jigsaw.w3.org/css-validator/validator?text=.recenttitle%7Bfilter% 3Aprogid%3ADXImageTransform.Microsoft.Gradient%28GradientType%3D1% 2C+StartColorStr%3D%27%23FF003399%27%2C+EndColorStr%3D%27%23FF6699CC%27%29% 3Bpadding-left%3A8px%3B%7D&warning=1&profile=css2&usermedium=all&output=soap12 or .recenttitle{ filter:progid:DXImageTransform.Microsoft.Gradient(GradientType=1, StartColorStr='#FF003399', EndColorStr='#FF6699CC'); padding-left:8px; } generates <m:error> <m:line> 0</m:line> <m:errortype><m:errorsubtype>unrecognized</m:errorsubtype> <m:skippedstring>:8px;}</m:skippedstring> </m:error> which ain't well-formed, missing </m:errortype>.
http://www.w3.org/mid/E1DsL4B-0001OX-Vy@lionel-hutz.w3.org claims it's fixed...