Hello rusty1
That is strange, in case you did not know, "Caja" is the file manager.
It may be worth looking at your "Trash" folder, as this post suggests:
[Caja taking minutes to open after boot]
Remember, that if you have a usb-stick (aka "thumb-drive") attached to your computer and delete a file (or more than one file), that you have to empty your "Trash" folder before you eject the usb-drive - if you do not, then the Trash folder remembers that it contains files to be thrown away and may show a full "icon", but when you open the Trash folder it shows no contents (the contents are still on the usb-drive).
Does that help? 