I was running Tiger 10.4 on my G5 Mac computer and I used without issues Vyzex MPK49. Since I updated my operating system to Leopard 10.5.3 in order to run Pro Tools, I no longer can use Vyzex MPK49. The message I receive is: "Install from DVD. If you installed Midi quest from a DVD please insert the DVD into the drive or press Install instruments from Sound Quests website". Vyzex MPK49 opens with the about page saying "Now loading resources and configuring ports" like it used to, but it doesn't seem to load anything up. Now the main application window that used to show the keyboard is a black blank page. What can I do?