I am not an expert about this but I can not see you waiting.
Firstly I know that it is impossible to create a map/scenario in html5 because of the glitches and the bugs.
Secondly(It is very possible that I may be wrong about this) in SL(SilverLight) you can make but you can not edit them(?).
That is why people ask for html5 map editor I think and that is all I have heard.
PS:This a common bug,admins have been informed and the bug has been reported.What you have to do is wait one week.(again,I think)
I hope I helped.