RE: Opera 36 not loading pages properly for over a week
Simply rename your profile folder to something else, with Opera closed, and then start Opera again.
It should generate a new clean profile, with no extensions or bookmarks, and the default speed dial and settings.
Try surfing a few sites with that and see how it performs.
If it's no better, the problem isn't in your profile.
Thanks again. Did that, and a few odd things happened.
First, it moaned about 19 extensions and disabled them (eg WOT; not aware they had been a problem up to then).
Then it picked up one particular bookmark folder to place in the bookmark bar. It was my main base bookmarks folder that I transferred over years ago when moving from IE (actually in the Maxthon wrapper) to Opera, called "Internet Explorer Favourites".
Looks rather old, and I have no idea where it has plucked it up from.
So I tried a few basic sites:
www.ebay.co.uk (conveted it to https://www.ebay.co.uk) : (no load, blank page)
http://www.ebay.co.uk : get a badly unformatted text (not html source text) pictures & graphics about 20 pages down
So, problem with https pages, but still other problems (ebay unusable either way).