Chicago-area theatres who have contracts with Chicago Plays started getting notices in mid-November that their costs would go up, beginning with the December playbills
At least one theatre balked at that. Jeremy Wechsler of Theatre Wit (who writes the Space Odyssey column for PerformInk) thinks that asking theatres who have already signed a contract to pay more is a classic bait and switch.
I don't think any of her reasons are untrue, you just can't legally do it, said Wechsler. I think they can charge whatever they need to charge, but the have to charge it for January.