Over the past few days we have had intermittent problems with the Quicksearch option on the Articles Search tab.  The problem is with the database that we connect to on the Internet.   They are aware of this problem and are working to fix it with a status of "critical priority".  For the time being, we have changed the default search option to be the older Basic Resources.  The Quicksearch option is listed in the dropdown, so you can try it, but you may not get results.