With the latest private beta of Safari available on connect.apple.com with any ADC account (free accounts included) reveals an issue with Coherence. Each time Safari load a website, the window simply disappear, just like if it'd have been minimized. If I click on the taskbar button to activate Safari, the window comes nack, but it disappears again if I load another website. For information, this issue doesn't occur in Window or Fullscreen mode, and neither it does on VMWare Fusion in Unity. It only happens with Parallels using Coherence.