When I have v518 open it calls 2 quicklook processes in a very CPU demanding way and makes my macbook's fan go mad.
First I thought it might occur just to generate the .afpub icons in the new Open window – but the icons all were done already and "quicklookd" & "QuickLookSatellite" kept running for more than 10 minutes, which made me quit v518.
As soon I close v518 also the quicklook processes stop.