Listen to Arturio: This is a cookie problem, and not to do with support:
- find the cookie relating to the site/log-in:
- save it.
- flush the others.
- re-start.
- put yr cookie back.
- and just maybe.............
- everything works.
But I have recently learnt that cookies can be passively "trapped" so be careful. If you have pots of cash on a poker site, best to write or remember your log-in details, (A pain, I know), and manually log in every time. Otherwise a bored nerd like me might be trying things out..... and have access to your account. (This is quite easy BTW)