1) You have to be kidding me again.
I disabled System - Web Push Notification and then Registration, Slideshow images and Mobile menu , ALL 3 DISAPPEARED ! LOOK AT THE VIDEO!
https://youtu.be/RkMxZ0T8GyI
So I re-enabled it again.
It is clear that you don't know what you are suggesting. And the same with "System - GameWorld" . It is NOT going to be disabled because it has vital stuff.
And the phrase : "I can fix it for you, but will remove some functions that I don't known what is it." looks VERY dangerous!
2) I have 10 editors who work for me and they can witness that the Facebook image share is now working at 50% of cases for new articles!
We need to wait at least 20 minutes so that the Image appears. Probably due to cache.
Before you changed things this problem did not exist.
And no, it is NOT Facebook's fault, because the cache means that Logged in users are a priority and they see articles a few minutes faster (something like this)
Anyway, first thing first. Registration.
As you see in the User Manager, there were registrations every day.
And since I don't like the phrase: " : "I can fix it for you, but will remove some functions ", my answer is "You are NOT going to remove ANY function from the website. Connect me with your MOST EXPERIENCED developer in the company, to join THIS chat and SOLVE the issue!
Otherwise I will have to pay Belitsoft, and so you will have to refund me fully for this semester's subscription so that I can pay THEM to fix it (which might cost more eventually).