I suddenly cannot open any photo files in Photoshop CS6 64bit. I can't open by right click>open as, or by opening within Photoshop with File>Open or from Lightroom 4 using Photo>Edit In>Photoshop CS6 or using Bridge. If I reboot my computer I can open one photo and then I can open no more. The files are fine. They all open in Lightroom. I've made no changes to my computer settings, etc.