@salisburync They're not late in paying. Their payment policy clearly states that they pay around the 15th of the following month you do the shop. Key word: "around." They don't process payments on weekends.
Evidently one client is still holding shops and they didn't pay them and will not until Thursday when they are released. While I can understand that happening, I'm sure they knew before they sent out payments that were missing this "chunk". A preemptive email goes a long way in my book, not being blindsided the way I was this afternoon. Not cool.