why isn't FM seeing my art files

I am working with FM 11 unstructured version. Lately FM is not recognizing art files. I know they are in my ART folder because I show them in another explorer window when I do a search. Yet when I try to import them into my FM chapter, they don't show up (File > Import > File). So if I copy and paste into the ART folder (causing two files with the exact same name) FM will recognize one of the art files (still not see that two copies are there. This is making my already very large ART folder even bigger. And when I need to edit the art, I don't know which file to use (I've been wrong more than I've been right on guessing). Has anyone seen this? I believe the problems started about a month ago when FM was crashing almost every day. I have been doing a MIF wash at least 4-6 times this month. I'm not sure if that is a contributing factor. Thanks.