Good afternoon René and welcome back!
Thank you for reaching out to us and for providing your system information.
We are sorry to hear about the calendar not showing up with your WordPress theme.
I would love to help you with this topic.
There are 2 things you could do:
- Could you change the setting under Events -> Settings -> Display (Events Template) and see if that makes a difference ?
- Send me a copy (in a private reply) of your theme files via a .zip link (Dropbox, Google Drive, etc..), so that I can run some tests
Best regards,
Geoff B.