ba0x55

For me the fix does not work either. I leave XCache deactivated for the domain using ographr. Maybe one of the next stable versions (on my distro) of PHP/XCache will get me rid of this.

Okay, I think I found the bad guy. While tinkering around with this XCache chrashed with a segfault and after this I could activate the plugin with no problem. After restarting the PHP process with loaded XCache I got the error message as above again. So I deactivated XCache and everything is working fine.

Sigh.

I always do a manual install so this makes no difference. I also set up a new database and instance of WP and tried only this plugin, but no luck. Even in debug mode are no other messages. So I assume that there is a problem with the latest PHP update, hardened settings or something. I am irritaded, because it worked before, no sufficient changes were made and everything else is working.

Your guess is correct, using the latest version of OGraphr and WP is not running in debug mode. PHP version is 5.3.18 and I am logged in with admin rights.