Are any of these soup playlists or just regular ones? What OS are you on? I tried to create a similar situation on mine and I can't it to happen (on Win2k)... Do you cut with Right-Click=>Cut or Ctrl-X? Do you select from the tree or from the table? Same for paste -- do you right-click=>Paste into the tree or the table?

Also -- how are you launching jemplode? Are you just replacing the jemplode20.jar in your install dir and running the exe or do you have your own JDK and you're doubleclicking jemploe20.jar?