Would it be right to say that, the positions that pushed MF Global to bankruptcy have now all comeback?
Hard to answer that q if you ask me skc, I mean it was all short term Gov debt, as long as those Govs didn't default there wasn't really a risk of MF bankruptcy...what caused the bankruptcy (imho) was the behaviour of JP Morgan and regulators.
This article by London Banker says it best, I recommend both the article and the author.
http://londonbanker.blogspot.com.au/2012/01/survivor-bias-and-tbtf-tyranny.html
In regards to the securities themselves, most of the debt series they held have tightened the spread versus Germany again, but at the same time Portugal is significantly wider now than it was.