When I played my first PYDT, I found the save file was not uploading and did so via the website. I believe I know what I did wrong…
I downloaded the save file and immediately clicked return to the game list (i only had one game going at the time of course)
Please add additional instruction to the client interface. When you download the save it say Now play you darn turn. It should emphasis somehow to not return to the game list until you have played you turn as the file needs to be uploaded
Giving my 2cents on being a new user.