It's a problem from Opera's side. Opera's Ad blocker is totally broken.
I use Opera Mini too. In there, Opera Mini can not able to block any single ad though I've turned ON Ad blocker (In Automatic/High mode) And now this ad blocking problem seems on Opera browser too. This problem is everywhere.. & Opera's developers are sleeping as usual. Bugs & Problems are not a concern for them.
I wonder, all of a sudden the developers will wake up from sleep then will announce some Design changing, User Interface, Icon, Color changing s**t in the next version release of their browser instead of problem & bug fixing and optimization.

Annoying Ads Everywhere.
All users get annoyed by Opera ads but developers are sleeping.

I also face this kind of ad showing problem.
Ads are annoying !!!!
I turned off "Lock Screen News" also turned off "Start Page Content" and turned off "News Notification"
But still I'm getting those annoying news ads.

Opera Mini disappoints us. Thumbs Down. Booooo !!!!!

Opera Mini has so many problems. Day by day it's getting worse.
Now it's bloated with totally dumb unnecessary feature like 'File Sharing'.
Can't able to block any single ad via Automatic & High saving mode and yet they claim it's an ad blocking browser.
Has frequent page loading problem.

Day by day, Opera Mini becomes a piece of sh*t. Since the developers ignores users expectation Opera Mini is falling down & down.
An ad blocker browser becomes a great host to show those crappy dumb annoying ads !!!! Seriously??? Who wants to see those dumb news ads? The answer is Nobody.
Now on the latest Opera Mini for Android; news are like floating here & there.
Previously there has;
Address bar ads & now Home page news ads, Notification ads, Lock Screen ads..
And maybe developers are thinking to add Pop up ads, in built banner ads etc etc bla..bla..bla
Ads are everywhere in this browser.
This is not good, definitely not good

From Facebook I tried to stream only 7MB sized video file. But after click play button then it starts loading & loading & loading.. After 2 minutes of loading then at the loading stage I press back button. And then Opera Mini stuck, it hangs my device & crashed. Please, fix slow loading time for streaming video. Moreover, Opera Mini can't stream/play (mpg) formats video. Add this formats to the built in video player.
Moreover, Only very few streaming videos are optimized via "Video Boost" feature.. Why??
Upgrade the 'Video Boost' feature.

Facing problem on Facebook using Opera Mini.

In "High Mode" on Facebook. If I press top right side button then that 'Facebook Setting' page doesn't come up. Moreover, I can't go to my Timeline, Can't go to Facebook Account settings.
After pressing that button Opera Mini just stuck & can't load that following page.
in Extreme mode its OK.
But while in Extreme mode, I can't able to share any YouTube videos from YouTube to Facebook. From YouTube website If I share any Video to Facebook It ends with an Error Message.

Day by day, Opera Mini becomes a piece of shit..
Fix those problems ASAP.

N.B- I'm on Samsung Galaxy J7 (Android 5.1.1) Using both latest Opera Mini 30 & beta 31 on 3G (HSPA+) network connection.

@mbaluta
@olasia
@miyukiwork

Please take a view on Facebook problem.

Moreover, I can't enter to my Opera Account inside Opera Mini. Opera Sync feature From Opera Mini's settings "Sign into Opera" section. I give my username & password. Then it shows
"Temporary Server Error. Please try again Later"
Fix this problem too.

When there has old opera mini this kind of ads were frequently appeared but with the new native opera mini those ads were no more.
But now they all those crappy annoying ads are back in action now.
Opera decides to bring back annoying ads & irritates people so miserably.

Opera is nothing else but loses their market share. Just because users get annoyed with Opera & behind the annoyance Opera developers disappoints users by creating more & more problems rather than they fix problems and any improvements.
I also get annoyed & try to find alternative to abandon poor Opera.
Alas!!! One of the greatest company now becomes bullshit.
Market share reference (from StatCounter):-
http://gs.statcounter.com/browser-market-share/mobile/worldwide/%23monthly-201709-201709-bar

I'm also facing the very same problem.

Opera Mini has so many problems. Day by day it's getting worse.
Now it's bloated with totally dumb unnecessary feature like 'File Sharing'.
Can't able to block any single ad via Automatic & High saving mode and yet they claim it's an ad blocking browser.
Has frequent page loading problem.

@danher
Opera Mini's Ad Blocking problem still not fixed yet

The Full Screen Ad Page frequently nagging in Opera Mini.
Too much annoying.

Extreme saving mode totally doesn't work on any Website.. Including Facebook, Twitter, Google, Wikipedia, YouTube bla..bla..bla....... No website doesn't works.

If I change it to "Data saving OFF" mode then everything works as well or If I do use any 3rd party VPN software then Opera Mini's Extreme mode works as fine as previous.

Maybe it's from Opera's Servers based on Location. I'm from Bangladesh. And I checked & tried Broadband/Wifi connection & different mobile vendors 3G connection and yet nothing.. Opera Mini's Extreme mode doesn't works at all.

Moreover, PC's Opera also has problem after this incident. PC's Opera failed to connect it's in built VPN, failed to connect to it's Update servers, failed to connect & go the Opera's FTP site.

*** By the way, if I use any VPN then all of those problem are solved. And no, Opera isn't blocked by our Govt.

Same here.
Opera Mini's extreme mode doesn't works. Also Opera PC's VPN doesn't works.
But if I do use any 3rd party VPN like Betternet, Psiphon, Hotspot Shield then Opera Mini's extreme mode works as well as Opera's VPN.
What's wrong going on with Opera's side????

Proof of the problem. Attach a snapshot in here.

Look the Images aren't loaded. I did refreshed the webpage but still images can't be seen.
And after browsing a while, suddenly I can see all the images.
And from the Data Saving feature, Images is turned ON totally with set it to medium quality.

No way..
Sometimes I also face this issue.
Only Extreme mode has this problem. Suddenly Facebook's images doesn't load & if I do reload the following webpage then still no luck. Images can't be seen.
By the way, I'm just sick & tired of Opera Mini problems.
I already headed toward UC Browser

Still Opera Mini can't able to block any single Ad both in Automatic & High savings mode.
From the settings menu
"AdBlocking" is ON
"Acceptable Ads" is totally turned OFF
But failed to block any single Ad in Automatic & High mode.
Only Extreme mode is totally fine. Works Good.

Built in VPN:- Well, Opera already has a great VPN but it isn't coming for Opera Mini yet. Consider to add these features.