Hi Cliff,
Thank you for your response.
I have updatet WordPress to 4.6 now, the other two updates you see are non-Modern Tribe updates (Contact form 7 + Adminimize) so that cannot be the problem.
After the updates I have tried switching the language to English, but unfortunately that doesn’t fix the problem as well.
I have attached a new copy of the System Information here: https://we.tl/IXqDamy2by
Hopefully you can see the problem now so we can fix it.
Thank you in advance,
Christian
PS. the share a file tool isn’t working? He says my file extension is not accepted.