I have been having a lot of trouble since I upgraded to 10.5.1. Apparently, there is an application called the PubSubAgent, which is linked to/used in syncing Safari bookmarks with dotmac. I do not use dotmac at all, nor is it set up on my computer or in sys pref. Safari no longer works since the 'upgrade.' It unexpectedly quits every time I open it. Every 30 minutes, I receive an error msg that PubSubAgent has quit unexpectedly as well. I am now using Firefox to connect to the net. AppleSupport had no idea how to fix this. Is there a Genius out there that can help me? a) Is it possible to fix this? If not, b) Is it possible to delete anything and everything associated with dotmac so that I will not have this problem anymore? FYI, I have deleted Safari and the error msg about PubSub still pops up. - Is the earlier version of Safari compatible with Leopard?