I'm doing my best not to let it bother me - it just seems strange that it was such a rapid change. Hopefully it's not a permanent change but if it is I'll just have to roll with it and take the good bits where I find them!
We had a good time today - no attacks. I removed all the cardboard and magazines from his shelves and put toys for him to fling around up there. I also filled a tray with fruit, veg and treats topped with shredded paper and toys so he had to forage around to find the treats. Once he cottoned on to the fact there might be tasty food at the bottom he was busy for a while.