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Created attachment 1283 [details] Capture of the bug. On the user page, the template brakes on Safari - Chrome - Firefox on Windows and Mac. It adds a "clear" between the left column and the main div.
Turns out Chris didn't completely use CSS that affects only his HTML. :) .clearfix is already used by UserProfile.css, I renamed Chris' class (in MediaWiki:Common.css) to .clearfixboth and edited his TEST: pages.
ah ha! thanks ;-)
Thanks David!