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I'm guessing that from the name 'rocketscript' that this is coming from WP Rocket. There have been several issues related to using WP Rocket from other users in the past.
Basically running caching on a static page is fine as the page content doesn't change, but as Simple:Press sits within a page but it's content is dynamic, caching causes problems.
Most caching plugins have the ability to select pages to exclude from caching, although I've not used WP Rocket, you will need to firstly make sure the page SP is on isn't being cached, and then you should really clear any cached files to make sure nothing is left behind that could continue to interfere after SP is excluded.
OK, well it sounds like if someone was working on your site last week then that could have been the 'what's changed' moment.
Not too familiar with caching plugins but it's possible from a quick search that rocketscript is actually something to do with Cloudflare maybe?
Again - Don't know much about it, in fact all I know about Cloudflare is it's fine for static content, so if you're running it you need to figure out a way to make it play nicely with Simple:Press / Dynamic content. We have a couple of people here who do run it successfully but will await your answer on that before digging deeper.
In that case, perhaps you will find this very helpful post from FidoSysop helpful:
I figured the solution he was posting was that turning off CloudFlare Rocket Loader off solved the problem, are you able to try this?
I guess the bottom line is that caching the forum and minimising scripts is going to cause problems for the forum, and my understanding is CloudFlare compresses scripts (which SP already does) and caches pages. Aside from that I know nothing about it.. I'm not sure Andy does either but Steve might so we may have to wait for him to get online to take a look.
Here is another thread that might be worth a read in the meantime:
exact same thing? was the resolution the same?? and same thing would have been updating wp to 4.5, simple press to 5.6.5 and then updating our plugins... doesnt sound like that is what you did? so may not be the same thing... please explain the situation so we can help...
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