Hello there,
This issue is not coming out from Joomla or hosting parameter.... It is clearly a bug of the versions 5.x and up. Page Builder saves on the database the page but does not load it when you click on the page to be loaded later on ...
This code
DISABLE CACHING
<IfModule mod_headers.c>
Header set Cache-Control "no-cache, no-store, must-revalidate"
Header set Pragma "no-cache"
Header set Expires 0
</IfModule>
you provide may work but cannot disable the cache in 500 sites in order Page Builder to work... Will increase the load on my servers for no reasons..
Also Investa quckstart package does not have Cache enabled from default and the issue still exists...
There is not need to give any sites for check ..Just download Investa install it and try it there... It will not work ...
This must be fixed soon ... REALLY !!!! You have a great tool but this issue and handling of it so far from side makes people believe that you are not supporting enough the module... Iti s an 11 month issue and still no resolvation ... If this issue is not resolve at the end you are doing a lot of damage to our work ..We cannot upgrade to Joomla 5 or cannot use latest template... Everything is useless...
So please reolve it and fast.... This is something that has to be fixed in no time from time !
Any help need to find it accepted but really take a look at it !!! SERIOUSLY !!!!!