This has happened many times. Lightroom crashes because it cannot handle its own features (HDR Merge and Panorama). It crashes and when I try to open the application again, it say Catalog is being used already. It is not. No applications are open, I have force quit everything. There are no ways for me to reopen Lightroom with all the photos I need. Just small batches of photos. This is unacceptable to be happening for problems your app creates. I have to restart my whole computer to get it to reopen again. How can I fix this, how can this be solved so I don't have to shut everything down because of your crappy interface.