[Geoff Winnington-Ball (RIP)]

I've noticed this as well, have not isolated it yet but believe it's to do with the new software package itself. You will eliminate that error by clearing your cookies and starting again - for some reason it seems to be half-reading the old cookie rather than overwriting it.

Beware Firefox as well... I've noticed that if you leave a Firefox window open long enough, the cookie associated with that window becomes corrupt. Then you have to close & restart the application.