Has anyone had problems logging into Uru Live? I managed to get in but navigation was so sluggish that it was impossible to play.

That probably wouldn't be your problem. It might be your Internet connection is slow today or it might be that the Uru server is having difficulties. There's not much you can do about it other than check the Mystonline forum for announcements:
http://mystonline.com/forums/

Thank you Jenny100. Looks like the servers are the problem.
Edit: Just logged in with no problems and all seems well.