I've now got 0710 Beta4 up and running without leaking memory. Now I have another issue - I was seeing this under Beta3 as well, but I was hoping it might have been due to something else (or had already been fixed).
I have created my first user through the admin web page. When I try and log in as that user, though, I get the dialog you see if you've hit refresh on a page that you got to via a POST ("The page you are trying to view is the result of posted form data...") Hitting "Resend" just gets me the dialog again.
Did I do something wrong creating the user?