Good evening Norbert and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about the all recurrent events link not working for you.
I would love to help you with this topic.
As a starting note, please know that although the problem seems similar, there is a good chance the cause can be different. The good news is that we’ll make sure we find a solution that works for you.
From the looks of it, you have done some pretty nice customizations on our calendar. It looks great!
However, there is chance that these customizations might require some updating to work properly with our latest plugins.
There is also a chance that the issue is caused by a plugin conflict (and not your theme).
Either way, could you also please go through our testing for conflicts procedure (preferably in a staging/dev environment or local install of your WordPress website) and let us know what you find out.
Basically the goal here is to revert back to a bare WordPress installation to see if the problem persists. It also allows us to pinpoint what the cause of the issue is.
Best regards,
Geoff B.