I finally figured it out. It was an extension, specifically uBlock origin which I prefer over the Opera ad blocker because Opera's block all of my news feed and some other sites that uBlock doesn't and I'm certain it as effective at blocking the ads I don't want to see while allowing the ones I do.
The solution to fix it is easy. Just go to the page that isn't displaying then click on the uBlock icon in the extensions toolbar and a popup will appear with a big power icon. Click on that icon and the problem is fixed.
Thanks again for everyone's help and hope this will help others having the same issue.