If you are having trouble logging in, try deleting your browser cache.

To do this in firefox...

1. Tools>Clear Recent History
2. Set the "Time Range to Clear" dropdown list to be "Everything"
3. Check all the boxes (or just try a few and see how you go).
4. Click the "Clear Now" button

Or in IE...

1. Go to Tools>Internet options
2. On the General tab, under Browsing History, click the "Delete..." button
3. Check all the boxes (or just try a few)
4. Click the "Delete" button