Yes and no. Yes the problem is related to DNS, but no its not one specific DNS-server that broke. What happens is that not all DNS servers have been updated to the new ip adress. And those of us that still have a disabled "ranking list" button are connected to DNS servers that still need to get the new mapping.
If you want to read more about this (dns propagation) see http://www.eleven2.com/brain/knowled...article&id=247