progets,
Thanks for the help. Verifying the syntax allowed me to really analyze what was going on. Once the No Clones filter was applied, AM started showing odd titles like "Zorro6a" and things like that. They are roms that are in my roms folder but they are from a later version of the MAME set. (I'm running GroovyMame which is based on 0.171, the roms are 0.175.)
So I checked the listxml in the AM folder and all those roms with no official titles just showed up with no data such as year, manufacturer, etc. I think now I just need to either manually edit the xml file removing them from the list or add additional filters to remove them.
Once I scrolled past all the oddball names, I found that the clones had indeed been removed!
I appreciate your help! Making progress!
Shawn