I'm not telling you it is not a problem, I'm telling you the problem is not with omp. Forget the mussorgsky stuff, it's just a little extra information about the consequences for those who care about it.

AFAIK, stock and omp both rely on tracker to keep an index of the media files on the phone. When you get the little banner about indexing the files, it is tracker that is doing the scanning. The command given is suggested all over the board and so that is why it was suggested. First result for "n900 tracker duplicate" in google: http://talk.maemo.org/showthread.php?t=76086

Have you moved files from a previous location:
http://talk.maemo.org/showpost.php?p=568768&postcount=4

The directories tracker makes use of are listed in the output of tracker-process -r. It also uses ~/.config/tracker to store settings in a file called tracker.cfg.

edit: and yes, touch did cure my problem picture in gallery.