The computed style of flex-item-align should never be auto.
Created attachment 140303 [details] Patch
See discussion here: http://lists.w3.org/Archives/Public/www-style/2012Apr/0831.html
Comment on attachment 140303 [details] Patch Clearing flags on attachment: 140303 Committed r116166: <http://trac.webkit.org/changeset/116166>
All reviewed patches have been landed. Closing bug.