I upgraded to Sibelius 6 largely because of its interface with GPO4, and I got it configured very easily. I created a configuration that uses three instances of the Aria Player (AU) and they played back my orchestral pieces just fine. However, I wanted to see what percussion patches were loaded but when I went into Playback Devices, chose the Aria Player and then Show two odd things happened: 1) the player (that had been playing just fine all afternoon) told me that the Aria player was not yet registered, even though I registered them the day I bought GPO4. No big deal, I just dragged the registration png over each instance and they registered just fine. BUT: 2) the player now shows up completely blank, except for the very middle of the keyboard at the bottom of the window! If I click around the keyboard more keys show up, but I can't get anything else to show. Has anybody run into this and better yet, have a solution?
The sounds still play though. I'm on an iMac PPC running OS X 10.5.8, Sibelius 6.1, GPO4.