I also was dropped from the Development Platform when I set my personal URL yesterday. I sent a message to Stephanie, the nice lady who offers help in the MySpace Team Blogs. She replied with “Please write this in the forum - that's the place for tech support. Not me.“, so I posted a report in this forum under the OpenSocial category:
http://developer.myspace.com/Community/forums/t/217.aspx
I haven’t received a reply yet.
I hope this Development Platform isn’t being run from Larry, Moe, and Curly’s basement.