Hello - WidgetBucks May payments were sent on Monday via PayPal. Checks in the U.S. will probably arrive late week (i.e. today or tomorrow). Sorry they were sent later than normal this month - they usually go out within the 33rd-37th day after the month.
I've received May payment by PayPal. They don't update the MyBucks page very frequently from what I've noticed, but they always sent payment on time.