I am using Joomla 5.1.0 and SP Page Builder 5.4.1.
I can open and edit the SP Page Builder pages in the backend editor, but the content of a Text AddOn is displayed a bit strange:
https://img001.prntscr.com/file/img001/eYbv8-8KRhmuQ45rQ0K7uw.png
Nothing is displayed in the frontend editor:
https://img001.prntscr.com/file/img001/g9BR3UfOQryJYeshfUtZHw.png
I haven't changed anything on this page for a long time, so I don't know exactly when the problem started.
Regards - Marco