Had been scanning multiple photos without a problem. However I must have unchecked a box (I'm new) because scanned pictures will will not divide. What is the fix please?
First try putting some photos very crookedly on the scanner, making sure there is space between them to draw a straight line. If that doesn't work, quit the editor, then restart it while holding down ctrl+alt+shift(comamnd+option+shift on a mac). Keep the keys down till you see a window asking if you want to delete the settings file. You do.
It turns out the problem was a single high gloss photo with a lot of white that caused the problem. Now to understand why.
Elements may have had trouble finding the boundary without any contrast. Sometimes for photos like that you can help things by putting a piece of dark paper or posterboard on top of all the photos.