ouch! i used to get that when i didn't plug in the dongle and tried to launch Mainstage (same as Logic.) hmmmm....if you could only get Logic to load without any plug-ins, one time, and then go to the preferences/manage plug-ins, and DISABLE the Jupiter Demo, then go back to normal Logic usage, it would be okay. Maybe if you take the Jupiter-8v2.component file out of the Root/Library/Audio/Plug-Ins/Components Folder, and THEN launch Logic, you'd be okay?