At least in Jeff's case, I would definitely say "no". Even just like 3 months ago, he was saying that he liked the Krank tone better than Chris's Engl. But, he also seemed to have a desire to explore other amps than Krank, citing the fact that he had never actually signed any paperwork with them and could technically "leave" them whenever he wanted. I've never heard him say a bad thing about the Krank people though, so even if there are some personnel issues within Krank, it has nothing to do with Jeff's situation...in fact, I remember him saying that he would feel bad if he "left" Krank, because they've been so good to him.
My guess is that when playing these recent Europe festivals with an Engl, he realized just how much he really loved the sound...enough so to jump ship. But that's just a guess.