Anyhow, some images won't open in XNview MP, but rather open externally when double clicked. The image that's recently highlighted this was taken at more or less the same time, with the same camera and are the same format. Windows can open the image all the same also. The only difference I've noticed between the two photos is that when I go to "Properties" the 3 dates near the bottom of the window are all 12:00 even with no date info, while the other images vary, as they would. Under the "Details" where all the exif data is, everything looks consistent, so my guess is whatever is going on with the "Create", "Modified" and "Accessed" info should lead in the right direction to figuring out what's going on with this issue. It's realllllly obnoxious
