Like you suggested I have deactivated and deleted the live composer plugin, (made a backup first) and installed an older version 1.1.3.
Single posts now work as it should again (to who it may concern the issue is in Live composer version 1.1.4)
One more question regarding the single posts. I have the single post set (in customizer) to full width, but the featured image denies to cover the full width of the single post container. It still remains the size as if there is a sidebar, onle there is non except for white space. The text does cover the full width nicely.
So I added custom css to force full width on the image, and now it covers the full width of the container. so far so good…
The strange thing is only that the image i added is 1240 x664 but the image the single post displays after the custom css looks like it is a small image strechted out. Like the resolution is far lower.
link to the original image:
link to the post:
Can you please advise?