Richard Justice, not a typical go to guy, has this one pegged,
"Even after 238 big-league appearances, even after establishing himself as one of baseball's best closers, Lidge remains a work in progress. He was among baseball's best closers last season before a pair of postseason defeats.
Some have been quick to look for a larger meaning. Like permanent psychological scarring. There's a textbook description for this kind of analysis: stupid."
Article says he's blaming his windup and will work permanently from the stretch.