Upload & Sell: Off
I don't know if that can be an issue, but they realised v4 some time ago, and I've experienced some problems with my v3 and it turns out that they no longer support that version- in short, when you want an answer to your problems it has to be v4 now.
Yeah I am using v4. They said its because of image size, which I lowered, still no good. I'll email them again and see.