When opening sessions, occasionally I notice Pro Tools will beachball while attempting to restore tracks. It doesn't appear to be a specific track or even a specific session that triggers this behavior. When the hang occurs, I have to force quit Pro Tools. If I then try to relaunch Pro Tools, the application fails to open at all. I just see the Pro Tools icon bouncing in the dock. Restarting the machine typically resolves the issue. Currently I'm running PT 12.1, but I've observed this behavior as far back as version 11. This is a major workflow impediment and costs me hours of lost productivity every week. I'd love to see this issue resolved ASAP.