On the RC 1 and Masters install, the Admin account login history is not being recorded in the History>Logins section. Probably doing the same on regular members but I have not checked that yet. :)
Hmmmm .... is working now but in a weird way. Test site did not show any of yesterdays logins. The test site also did not show any of todays 5 logins until about 3 hours after the first login.