These doors are usually a steel skin bonded to a wood and/or foam substrate. Chances are that the bond has failed.

Now, there's a chance moisture has entered the frame due to failed or improper flashing. The swelled or moved frame may have intruded upon the gap between door and frame...the consequence being that door caught on the frame and pulled the skin away from the door.

The best practice, IMHO, would be to purchase a pre-hung door...you can pick up one for less than $150.

They are quite easy to install, and doing so gives you the opportunity to ensure the opening is flashed correctly. If you do, insulate well the area between the rough opening and the door frame with non-expanding foam. The cans are marked for doors and windows.

Of course, the foregoing is posited upon the foundation is the area not having shifted and being the cause of the opening coming awry!

Rod

just take the door off and use some Gorilla Glue to put it back together. After applying the glue, use some clamps to hold it in place for at least an hour. Be sure to read the directions on the Gorilla Glue. You have to wet the surfaces first.

Patrick-

Good info. Too bad the OP didn't get this input 10 years ago ;-)

yeah i figured someone else might need the same info, though.