'Glad you got it fixed, Ron!
The first thing I do, when I receive Sortainers from Festool, is to check the drawers. Believe it or not, the packets of drawer dividers that come with every Sortainer can cause them to get stuck.
In the event that a drawer is stuck because something lodged against the drawer and the ceiling above, I can only offer the advice of fairly crisp impact on something like padded carpet, one's thighs, or a padded chair/couch in all directions, while working the drawer back and forth as far as it currently travels.
Those plastic packets that the dividers come in are the worst - I've loaded drawers up with screws and they come loose easier full of screws than those divider packets.
Tom