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But something has changed, there can be little doubt about that. I have previously used Opera with this option set and not encountered problems previously with the sites I use.
A further update. This problem seems to have cleared up now on the problem site. There is some suggestion it could have been due to routing/timing problems over the Internet. Other than that I have no idea.
Then, when I set this option back again, to how it had been, the problems did not return.
Err...?Probably because the necessary data was already downloaded?
Possibly. Anyway, this needs updating.
It does seem that, for whatever reason, the latest version of Opera (Ver. 39.0.2256.48) does need the option: 'Block third-party cookies and site data' to be disabled. Otherwise I get two problems on one website I use - Firstly, very slow loading of pages. Secondly, some site icons do not display correctly, though they still work. (And they display correctly with the 'Open image in new tab' menu option.)
AFAIK this was not the case in previous releases of Opera. Why this should be so I do not know. Perhaps something has changed on the site? Perhaps the option did not really work as intended on previous releases of Opera? Perhaps there is a fault with the latest version of Opera?
But something has changed, there can be little doubt about that. I have previously used Opera with this option set and not encountered problems previously with the sites I use.
To add to the above -
After extensive maintenance on my PC (nothing showed up) I find that the Admin copy of Opera seems to be displaying icons OK. But my normal User copy does not. Also, when Opera last updated I lost my open sessions (Tabs) when I restarted it, in the User account.
Any advice how I can get the User copy back on track?
TIA
I have managed to solve(?) this.
On the site with the problems using my User version of Opera I made them go away, first by removing the setting: 'Block third-party cookies and site data'.
Then, when I set this option back again, to how it had been, the problems did not return.
Err...?
To add to the above -
After extensive maintenance on my PC (nothing showed up) I find that the Admin copy of Opera seems to be displaying icons OK. But my normal User copy does not. Also, when Opera last updated I lost my open sessions (Tabs) when I restarted it, in the User account.
Any advice how I can get the User copy back on track?
TIA
With the latest update to Opera for Windows, Ver. 39.0.2256.48, I too am finding increasingly that icons on websites are not rendering. Indeed, sometimes there is not even any text replacing the proper image.
I have also found the most recent releases of Opera seem to be running increasingly slowly on some sites.
Win 8, 64 Bit
"I liked having the recently closed tabs options in the upper left menu"
Its still there.
No it isn't.
It has been moved back to the 'broken heart' icon on the top right, where it was in a previous release of Opera, before it was moved to the Opera menu. As in the v.29 version.
Well, that's no help in viewing PDF files with Opera. 
Turning either version off means you can only download the PDF file. So, either download file and use Windows Reader or, for online viewing, use another browser!
"Things can only get better!" - Let's hope so...
Interesting!
I went to plugins and found I had two versions of the Chrome PDF Viewer enabled:
Name: Chrome PDF Viewer
Version:
Location: chrome-extension://mhjfbmdgcfjbbpaeojofohoefgiehjai/
Type: BROWSER PLUGIN
Name: Chrome PDF Viewer
Description: Portable Document Format
Version:
Location: internal-pdf-viewer
Type: PPAPI (out-of-process)
For now I will try disabling the BROWSER PLUGIN version and see what happens.
"V 29.0.1795.60 Intermittent problem. When I download a pdf, sometimes it will not open properly - I just get various lines or sometimes isolated text. Refresh makes no difference."
Me too. I can no longer rely on reading all PDF documents in Opera, I have to either change to IE or save to file and use the Windows 8 inbuilt Reader offline.
Can the Chrome PDF plugin reader be updated?
"chuckle you cant even read a mini dump what os in minidump"
So maybe I was too harsh on lando242 
Gee! It's good here, innit?
That's why I haven't been here for 2 years or so. Time to take another break, I think.
Using Opera 27.0.1689.76 under Windows 8, I seem to be again suffering from an old problem: pages don't stop loading unless I tell them to stop. This can slow things down.
I think your dump shows XP SP3, yes? Anyway, there is more discussion around this topic here:
https://forums.opera.com/topic/7961/27-0-1689-66-crashes-compuer/16
"Okay, well you're clearly more of an expect than anyone else here willing to put up with you. Answer your own question."
That really is so typical of the kind of shite answer we have come to expect on here.
The days of Opera being a browser light on resources and easy to run on older systems really are over. Welcome to the world of: "If you haven't got bleedin edge hardware I can't even be bothered talking to you."
I too have not so far found the need to "refresh" Windows O/S, unless something has gone wrong with the hardware. AFAIK software doesn't rust.