Update: The message that was supposed to go "After 4 days" was eventually sent 3 days late.
While it's good that the sequence seems to have re-commenced (let's hope the next message goes tomorrow), it's not good that I don't always seem to be able to rely on Chatfuel to do what I'm expecting. This is just one example of many different ways that Chatfuel can be a little temperamental and unreliable (see my other posts for other problems).
I could potentially become a Pro user but I would only want to pay if I knew Chatfuel was more reliable. On the whole I think Chatfuel is great and I really admire all the work that's gone into it.