I've just tried ridewithgps and it worked fine for me. You create a route, then when you look at your Profile/Routes, the route is there and has a few links under it to export as a route, track, KML and so on. You click on either of the first and you get the GPX file.
The cue sheet looks ok as well. What browser are you using? It's possible an older one (IE6-7) interact poorly with the site. Try the latest Firefox or Chrome.