That means you are using the lite version. On the bottom of the screen select the link that allows you to select your skin manually. That fixed it for me.
I thought it was a timer, not randomized. EDIT: nvm, <script>
var bgcolorlist=new Array("#0000FF", "#FF0000")
document.bgColor=bgcolorlist[Math.floor(Math.random()*bgcolorlist.length)]
</script>