Well since I had my PI disc out to check on something else, I went ahead and installed Media One, however will not leave it installed very long. I just don't like the program. I'm not clear on what you're really having problems with. I can add tags to my photos and they stick, and the program has no problems opening them, or seeing them. What exactly are you doing or mean...
fter tagging files with drag+drop,
have "All files" selected in the preferences
By this do you mean the File association? I don't think it matters to have any files associated with the program. The only files that I will allow a program to establish an association with, are the proprietary for the specific program. If I want to just view a photo, I use whatever windows default happens to be. I don't want an editing or cataloging program launching everytime I just want to look at a photo.