We're using Quickbooks 2008 in a Windows XP Home environment via Parallels Desktop on a new big screen Imac running Leopard 10.5.4. Rammage is plenty. The Quickbooks backup file (QBB) has disappeared from the Windows environment a couple of times, never to be found. We haven't yet installed the latest parallels build 5608. Could this be related? Any other possibilities? suggestions?