Hi Pavel and Toufiq
I was too fast in my conclusions. It did not work. I was sitting with another computer. (my office PC).
At lease, now I know that the SP page builder version and Joomla 4 problem is caused by my computer. Or in other words that the programme does not work with my computer, hence that it worked for you Toufiq.
Problem is that my pc is not very old and running, there must be a compability problem with the software. I guess thats a huge problem for your software and for faultfinding. (articles in Joomla 4 works fine)
Might be better to go back to older version of SP Pagebuilder and Joomla, there it worked fine.