Please confirm you have no ad blockers, firewalls, etc.

http://b2evolution.net/man/global-hits-summary

Also please try with a different browser.

Please also try our demo site: http://demo.b2evolution.net

I tried with Opera, chrome, Firefox, it never works!
But different from Firefox (my favorite browser) in chrome and opera I also got an error message at login:
nevertheless I am logged in !

Notice: Undefined variable: failed_logins_lockout in /www/htdocs/w0126f39/colonia-aktenvernichtung.de/b2evolution/blogs/inc/_init_login.inc.php on line 179

Warning: Cannot modify header information - headers already sent by (output started at /www/htdocs/w0126f39/colonia-aktenvernichtung.de/b2evolution/blogs/inc/_init_login.inc.php:179) in /www/htdocs/w0126f39/colonia-aktenvernichtung.de/b2evolution/blogs/inc/_core/_misc.funcs.php on line 6138
Ein unerwarteter Fehler ist aufgetreten!

Falls dieser Fehler bestehen bleibt, melden Sie ihn bitte dem Administrator.

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Zusätzliche Informationen zu diesem Fehler:

Headers have already been sent in _init_login.inc.php on line 179.
Cannot redirect.

Please also try our demo site: http://demo.b2evolution.net

your demo site is still down!

It's back up now. Please try it today.

(Do we really have to shout about it using heading markup to make our text as big as possible?)

Additionally:

Notice: Undefined variable: failed_logins_lockout in /www/htdocs/w0126f39/colonia-aktenvernichtung.de/b2evolution/blogs/inc/_init_login.inc.php on line 179 means you are NOT using and UP TO DATE version of /conf/_advanced.php`.

You created this error yourself.

sorry for my text formatting!
(i am used to SEO writing to much maybe because of that I like H2 tags )
luckily the correct _advanced.php resolved all Problems, Graphics and also the Tiny MCE works now

yes Thanx
my German support just told me the same!

die Meldung ist eindeutig. Die Variable "failed_logins_lockout" wird nirgends im Script definiert. Mit mod_security hat das überhaupt nichts zu tun. Wenn ich mir direkt vom Hersteller die aktuellste Version von b2evolution herunterlade, dann wird in conf/_advanced.php die Variable festgelegt. Bei Ihnen fehlt dies in dieser Datei.!

As I modified the /_advanced.ph I did use the update feature to not update that file

That means in future I have to check if any config files contain new variables and so cannot be excluded!

Anyway thanx for the support ! all works fine now!

Glad it works.

You should Not exclude the config fiels from auto upgrade. Instead, I recommend you use this additional config file for persisting your local changes: http://b2evolution.net/man/overrides-test-php