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MediaWiki has some built-in caching that means that even if you instruct your browser to do a hard refresh you still get old content. This can happen, for example, on pages that make use of semantic media wiki queries, where the cached result has recently become stale. This makes it hard to debug some complicated new queries as you're working on them (the workaround is to "touch" the file by saving a version with no edits). Admins have a built-in "Refresh" tab on skins like Monobook. The default WPD skin should have that as well.
Seems like this could preclude and make editing quite difficult so bumping to top pri. Infra issue to Doug.
Added Refresh/Purge option to Edit menu