This happened to me, as well. The buyer messaged me about a large custom order. I responded promptly via desktop and told her I would provide a proposal promptly, which I did. For two days, I did not hear from her. Then she wrote and asked when I was going to send it. I said if she looked up the thread, it was there. She was on her mobile and said it wasn't in her message thread, but I was looking at it. I began to suspect that Etsy might have had two distinct messaging systems, one mobile and one desktop, and they cobbled them together poorly, and that there is not one cohesive messaging system that works equally well on both. I wrote her back and she never responded and I lost the order. They need to fix this.
