Hi Nico
I rolled back PHP 7.0 to 5.6 yeasterday evening and the problem is solved.
Apache 2.4 and MySQL 5.5.5 are not touched.
I used TEC v. 4.3.1.1. I didn’t tried to turn of PRO yet, I can still give it a try if you like.
I also did a completely reinstall of WordPress when I still was on PHP 7.0, but that didn’t fixed the problem.
Are there other known issues with PHP 7.0?
Greetings