I have a series of master files which I have processed but I cannot locate them in any catalog. The masters are intact where they should be, but I cannot for the life of me find what catalogue they are in (along with the processing I rather would not have to redo).
Maybe the files are registered in one catalogue, but you can't tell which, or maybe they are in more than one catalogue and have different adjustments and metadata in each, or maybe they aren't recorded at all? One or all of these problems is often the result of fragmenting control of your pictures.
I'm the same as Jeff - one main catalogue, with others only having finite lifespans or being demo-only.