Rite Aid Post Loss, Cuts Outlook  CHICAGO (Reuters) - Pharmacy chain operator Rite Aid Corp.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=RAD.N target=/stocks/quickinfo/fullquote"&gt;RAD.N&lt;/A&gt; on Thursday posted a quarterly loss, compared with a  profit in the same year-earlier quarter, and cut its full-year  outlook, citing worse-than-expected sales.