For me, actually restocking some ammo reset the "Restock All XXXX" credits level to the amount I paid for the ammo (1030 in my case). Now it always says 1030 though nothing actually needs restocking. Well, at least it doesn't crash, though I do get a "Server Error" message.
Whatever the April update's number was, I am calling it "The Bait Shop" from here on in.