This occurrence involves data loss. I have had this happen twice. I has removing some extraneous items from downloads (PAR files, etc.). The first oddity is that the command button for Delete on the Window becomes unavailable when an item is selected. In each case, I clicked away in order to reselect the item. Immediately, the Window closes and it's contents are never seen again. They are not in the trash. I went to Terminal to do a directory listing. The name shows, but an attempt to CD to it gets a Directory doesn't exist error. Only common item between both occurences is that both folders were on my Sidebar. Now they are gone. This is a TIBook 500 with 10.4.2. Bob