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I commented out all my headers and footers on the site and am still getting the problem.
I haven't changed the layout in months, and we never used to see this problem.

One of the people on my site, who understands these things better than me, sent me this information (but it means nothing to me)
Firefox 64.0 on Ubuntu Linux

Clicked on bookmark (https://comeallwithin.createaforum.com/general-discussion/) with F12 developer panel running. Got white-out.

Request URL: https://comeallwithin.createaforum.com/general-discussion/
Request method: GET
Remote address: 64.79.105.131:443
Status code: 200
Version: HTTP/2.0

With disable cache option still white-outs.



Request:

Host: comeallwithin.createaforum.com
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:64.0) Gecko/20100101 Firefox/64.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-GB,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate, br
DNT: 1
Connection: keep-alive
Cookie: SMFcomeallwithin1=a%3A4%3A%7Bi%3A0%3Bs%3A2%3A%2213%22%3Bi%3A1%3Bs%3A40%3A%226d22767bbacc83b9f0d9fc3d79b2ad13677d725c%22%3Bi%3A2%3Bi%3A1736627106%3Bi%3A3%3Bi%3A2%3B%7D; PHPSESSID=1a9b6fd9c3b3e12c4f23e0e58a3b2266
Upgrade-Insecure-Requests: 1
If-Modified-Since: Wed, 16 Jan 2019 20:46:53 GMT


Response:

HTTP/2.0 200 OK
date: Wed, 16 Jan 2019 20:47:02 GMT
server: Apache
x-xss-protection: 1
x-content-type-options: nosniff
pragma: no-cache
cache-control: private
expires: Mon, 26 Jul 1997 05:00:00 GMT
last-modified: Wed, 16 Jan 2019 20:47:02 GMT
content-length: 0
content-type: text/html; charset=ISO-8859-1
X-Firefox-Spdy: h2

Does that help you at all?