I will open the site http://www.apfeltalk.de/community from 1Password 4 the message in screenshot come.
When I open the site via browser Safari and insert my name and password manuell I have right access.
My name is my email address.
My password is text and numbers.
I use Mac OS X 10.9.4
I use 1Password 4.4.1
What can be the problem?