I have tried to preview my game multiple times now and after an hour of waiting it is STILL loading. I have tried fixing the issue by converting my game into html but apparently there is no way to change it to html so I have no game.
Look here... sounds like there have been some server problems lately...
http://textadventures.co.uk/forum/general/topic/nd5s-91niuuq11wq8ct3qq/stuck-on-loading
(one reason I prefer download instead of playing, or programming, on-line)