Thanks micky4fun and Naphier....
The background stars did originally move, but for simplicity I just went with a static background. I'll take another look at this at some point I'm sure...
I've just submitted an update as I had to rewrite my POST and GET commands for the leaderboard. I was originally using SendHTTPRequest and not SendHTTPRequestASync, as in all honesty, I didn't know what the difference was. This caused the app to hang for anything up to ~30 seconds as it was waiting for the response. I now use the ASych command and do my own 'waiting'...
I have to call the global board quite frequently as the leaderboard scores are displayed in game... Anyway, I've rambled on enough, I think its all fixed now and the new version should be live in a couple hours