I have been using the Mac & Win client and I have found the Mac version to be a bit flaky. The UI has a tendency to become slow and unresponsive. I also have noticed that when you close the roster window you can not reopen it by clicking on the icon in the Dock. You can get it to show up id you go into the Spark Prefs, but the roster will not function after that and you have to quit and relaunch the app. I have tested it on 10.2.x - 10.4.4 (10.4 worked better) with similar results. Is there anything that can be done or do I have to wait for an update?