[Neos] FE Login not working in Neos 2.0

[Andreas Fürlinger]

Hello comunity,
I have a problem with the FE Login package. In my demo site here: dixema.de/en/download.html

Whatever you enter in the form submitting it you only got redirected to the same page. There are no validation alerts. Wrong or right credentials does not make a difference.
In the security log I see:
WARNING   TYPO3.Flow           No credentials given or no account found for token: Username: "preselect-demo"
But the account definitely exists.

Any idea?

Thanks, Andreas