Hello, I'm running PTE's on a iMac with XP on it... so far, so good... But there is a problem will running the PTE's ... sometimes the PTE had in a NO RESPONDING state, sometimes the show is getting delay's.... Additional information: we run in 16:9, full screen .... the videocard is a ATI Mobility XT 1600 HD (so we running HD!) Anyone a idea what the problem can be? First VISTA was installed on that machien, so I changed it to XP!!!! but that didn't help Regard, Kurt