Hey guys this issue was the same during Ver 1.0, but it goes away.
However SE does the automated "suspicious activity" search criteria, it learns the PCs you log in with legitimately and then you do not get the issue anymore.
That was my experience in Ver 1.0.
I just got the message as well and it was easy to fix. Go to your SE account's linked email, follow the link, change your password. After doing this once or twice for the PCs you log in with, you should not continue to get this error from logging in on your most commonly used PCs.
Edited, Aug 15th 2013 12:20pm by Gnu