I posited a number of scenarios, all of which have problems. The url for one app where I'm trying to export tables and have intermittant success is
http://lex123webofficelivecom.officelive.com/lex123test
That's not the real url, but the real url is valid, and does export after the first failure as I noted in the original post.
Another site/app that never allows export of any table is like
http://san123webofficelivecom.officelive.com/san123test
None of the sites accept a Move to Sharepoint operation. For those I spec the url like, ie expect an application to be created. I don't know what else to do because there is no guidance anywhere that I can find on this subject.
http://lex123webofficelivecom.officelive.com