Using the web editor?
Make sure the address you are using starts with
I had a similar story. I was trying to make a game, and it either wouldn't load, or it had a lot of internal errors. I ended up deleting it before I realised that it, for whatever reason, would work if I didn't have a special background colour. If you can get into your game, maybe try it? I don't think there could be any harm in trying?