If you see this message:
"There was a inconsistency with your session credentials, ..."
... when logging in or registering, then you simply need to refresh the page (f5) and submit the same information.
You will see this message if you have been sitting at the Login/Registration page for more than 20 minutes or if you're submitting information to these pages from an outdated cached version of the page.
Please get in touch (click close window) if you experience continued problems.