Okay, the start should work now, at least on Windows 64bit (this is what I can test). No idea, why the simple opensim.exe causes problems, the developers had fixed it times ago.
I hope, there will be testers around! There are several kinds of avatars to compare, and please use animations to see the behavior of the shoulders (example).
And be patient with the start, lots of data have to be loaded at the beginning. This is why Simona looks a bit funny with her old body looking through
To get a good result, clear the cache often or delete the complete Singularity-folder in the Appdata-folder of your machine.