I don't like ACR 12.3, so I downgraded to 12.2.1 (and I tried 11.4.1). I ran into a problem with Bridge not showing the thumbnails for raw images -- it simply put the PS icon in place of the thumbnail. I chatted with an Adobe "expert," and he/she couldn't get it to render the thumbnails. He/she told me I needed to go back to ACR 12.3 to get the thumbnails. He told me that my camera was too new, and 12.2.1 wasn't equipped for that. Well, ACR 12.2.1 was certainly equipped for my camera a month ago. Any suggestions?