I have posted this problem many times and each time I’ve been told by jupiter that it is the VC plugin problem.
So last week I decided to narrow this problem down.
The problem with post grids when used with a cache plugin is that after 24 hours the post grid will not display the content.
I set up a clean wordpress website using wordpresses default theme. (not jupiter).
I bought a copy of visual composer and created a page using a post grid
I installed my usual cache plugin.
After 24 hours THE POST GRID FAILED AGAIN!!
So now we know its NOT JUPITERS FAULT. I tried different cache plugins. Same problem. So I can safely say that it is Visual Composers problem so have raised a ticket with them.
My question now is what can I use as a replacement in jupiters theme to do the same job as the Post Grid??
Hope this helps anyone else facing this problem