State court voids contracts sheltered by federal law, says bankruptcy expert.
Regulator alleges carmaker made at least $56 million in improper payments to foreign officials over almost a decade.
Repurchase agreements treated as sales moved too few assets off the bank's books to matter, according to its auditor.
Treasury also reported that 84 percent of the top earners under his jurisdiction are still with their firms despite pay cuts.
Boards of companies bailed out by taxpayers must do more to improve their oversight of management, experts say.
