We’ve had quite a few users who’ve been having system lock up problems when opening Studio Vision 3.5.6 during the initialization of Quick Time. The solution is to simply increase the preferred size of Studio Vision in the “get info” screen by a couple of megabytes. If you can set it to 12,000k it will work great.
Note: Increasing the preferred memory usage of most Mac applications can make them run faster and more reliably.