Nothing really went wrong with their distribution of the Power Rangers. The Power Rangers just lost a little bit of appeal so Disney made a business move to stop distribution. Studio Ghibli I thought they were still involved with for US distribution. Studio Ghibli is going through some growing pain so to speak. They have some popular characters but it seems to take a very long time to release a film that is covered under the distribution deal.
Now the Pokemon deal just happened. I think it is a smart move because it brings an already popular franchise to the XD line up which personally feels like it has been struggling. I'm interested to see if this particular partnership goes beyond television rights in the future.