When you use "Auto Merge Layers" (Fusionar capas automáticamente" in spanish version), Photoshop crashes and stops responding, even if only work with two images.
Try to downgrade your Camera Raw it causes nothing but problems. I was unable to save my photoshop files, got font errors and even got random BSOD at shutdown and random crashes from low memory because of it. Go here and get the version 12.4 and hopefully it will solve your problem.