I'm not working with a LEM client this week, so I don't have live data in front of me. However, generally speaking:
1) Server 2008 R2
2) I'm assuming that "any" would be a good answer here. Generally we don't see anything at all. I don't have a good number for you here.
3) None known. I have seen this issue with service accounts and domain admins with diety-mode rights.