You did not helped me.

I apologize for that. The intention was there.

On the settings page just type 'wand' into the search field.
The fourth result should include the path to your wand.dat file.

Paste it in your URL field and press Enter.

Go to opera:config#UserPrefs|WandStorageFile

Dear Opera forum administrator, could you, please, make a Presto Opera forum section ? Thank you !

I have just tried disabling javascript and it doesn't make any difference. Why do you think it is a javascript issue ? What have you discovered ?
I have also trouble in my experience using Wikipedia with Opera 12.18.

Dear Opera forum administrator, could you, please, make an Opera 12 forum section ?
Thank you !

I still can't get any of those pages rendered, this is a permanent issue.

@stng : Can you access all of the examples I previously mentioned ?

@rlaing0727 : I may face the same as you, but only while the page is loading. Once loaded, the mouse wheel scrolling works fine.

All your addresses worked for me. We have so different results, this shouldn't happen. This is discouraging to find any logic behind this.

@stng Thank you.

Works fairly well in "clean" Opera 12.18

No, it does not, not on my side.

Check your Opera's profile settings
Try with new Opera's profile
Check adblock, extensions, AV settings etc.

No AV here, and have tried in a "clean" installation before my first post here - same result.

@rif Thank you.

I must say that I didn't expect that two of you can get it rendered.
This comes as a bit of hope but above all as more confusion.
Needless to say that I'm now more lost.

@blackbird71 Thank you.

As you, I have an indication that a secure connexion has succeeded, but the page remain all blank.

I don't think this is a totally general wikipedia problem, but rather one specific to either that page alone or involving some special/flawed coding, handshaking, or DRM techniques associated with that page.

Unfortunately, the problem isn't specific to that page alone.

Here are some examples of other pages I can't get rendered :

https://en.wikipedia.org/wiki/Don't_be_evil

https://en.wikipedia.org/wiki/Menelaus'_theorem

https://en.wikipedia.org/wiki/The_World's_50_Best_Restaurants

I would say it could occur with any URL with ' into it.
But I can't make a universal rule of that, because like you, I was able to reach other page including this same ' ...

WEll, it works in Opera 38 without a problem.

I was asking specifically for 12.18, why told me it works in 38 ? Sorry, but this was useless.

There are not too many people still using Opera 12 on here.

Have you access to visitors statistics (browser versions) on this forum ?
Opera 12.18 was released only 4 month ago, for sure they are still many users, especially here.
I even seen question of Opera 11 user recently, and some people able to answer it.

I'm just getting a blank white screen on that page with 12.18 under Windows XP.

Thank you davehawley. This is sad
Till now, there was just some not so important heavy sites I have issue with, but an issue on an essential domain such as Wikipedia is a breakpoint. I'm really pissed off now.