blank page with facebook login

I have the same issue with facebook. It's working with Ipad. But with firefox an chrome I get always a white screen after first registration.

Facebook:
STILL A BLANK PAGE WITH NO OUTPUT OF ERRORS

I don't know what to tell you in this regard. I'm not able to confirm this or find a cause for it. Debug output has been added to throw errors instead of suppress them in all cases now. Please contact your host as maybe they've mod_security setup and it's rejecting the page for security reasons.

Twitter:
I am redirecting to the twitter page and there there is a infinetly reloading

Twitter does this is if the URLs are not configured correctly. Please see the below screenshot for example configuration.

Google:
either there is a system message "Failed to retrieve Google profile. Error: User profile request failed! Google returned an invalid response." either i have a blank page

You don't have the Google+ API enabled in your Google account. Within the Google Console navigate to APIs & auth > APIs > Social APIs > Google+ API and enable it.

Linkedin:
Sometimes it is working, sometimes i have the system message "LinkedIn->retrieveTokenAccess(): bad data passed, string type is required for $token, $secret and $verifier.

Sounds like a caching problem. If you've page caching enabled disable it and purge the cache then see if issue persists.

I have the same issue with facebook. It's working with Ipad. But with firefox an chrome I get always a white screen after first registration.

Ensure you've 6.0.5 installed and have enabled debug mode and maximum error reporting. Once done retry and see if any errors output.

Thank you for trying to help. I updatet to the newest version. I get the message "Redirection failed" but only when I am not logged in to facebook. Enclosed you'll find my settings:

Thanks

Remove valid oauth redirect URIs. Then retest to see if working. The HybridAuth user guide and our tutorial do not instruct you to complete that parameter. Do not touch parameters we do not explicitly tell you to configure as these configurations are strict, which means 1 wrong parameter and it does not work.

Thank you. Should I turn off "Client OAuth Login" aswell?

No, that needs to be left on and is on by default. For Facebook you only need to configure the website, contact email, and under status & review enable it; that's all you need to do to have the application functional for CB Connect usage.