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The payment system is now weekly, pending a 20 day delay after the sale. I'm assuming that you're not on the Hyperwallet system, or else you would already know about the change from monthly to weekly pay schedules.
It was weekly for me at first, but not anymore suddenly. Been 3 weeks and all my last sales are still marked "to be paid".
I've heard that happen to others. You should email support@cgtrader.com and let them know ASAP.