Blimey! It worked. I thought for a moment that it hadn't - which would have been no worse than my expectations. But no, posting a blog recovers your profile contents (after a few minutes' delay).
I guess all this pratting around is what you get for hosting a data centre server farm serving 90-odd million accounts on a toy operating system (Windows, in case you didn't know).
A bit quirky, but there you are at least it retrieved the situation in the end.
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MySpace MySpace+down Windows incompetence