Fix session management in SC

[#1]

If you check "Remember my login." at login you expect that SC keeps you logged in until you logout. It works well depending on the item you click after a session timeout happened. In some cases it just takes a second longer but opens the menu item you clicked on. But sometimes it also gives strange error messages like

or

Would be great if this could be sorted out.

[#2]

This happens everytime I log out of one account and try to log into another using latest version of Chrome on OSX

[#3]

Yes, found this to be true in various forms in Chrome/Win7 as well as FF 6.0.2