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Weird black triangular graphics disruption - ad related?

Guys I have suffered the same app-specific graphical glitches (Photos + Safari) and compiled an in depth bug report with graphics, stats and graphs which I filed to Apple. I published it in copy in a standalone thread which I will update with official reactions or other learnings. At the time you read it, it may already be updated. 😉

Chime in if you want!
 
eRondeau said:
+1 here. Appears intermittently using both Safari and Safari Technology Preview. iMac i7 fully up-to-date on everything. I suspect it may be related to an ad blocker? I use Wipr. But I see exactly the same thing as the screen shots. Bizarre.
EDIT: NVIDIA GeForce GTX 675MX w/ 1GB VRAM.
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I use near bare bones Safari on an old 2013 iMac with a NVIDIA GeForce GT 750M 1 GB and this behavior still shows up from time to time.
 
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This gets worse for me with every update. I always try Safari following updates and with each one this happens more and more frequently on more and more websites. Still confined to my Late 2013 iMac though. Never a single problem on any other machine.
 
I've also been seeing this, for a few months at least. Not every time, but often. MacBook Pro 2015, Big Sur, Safari 14.0.3.
 
jive turkey said:
This gets worse for me with every update. I always try Safari following updates and with each one this happens more and more frequently on more and more websites. Still confined to my Late 2013 iMac though. Never a single problem on any other machine.
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I'm seeing it happing more and more often as well. Most common with MacRumors though.
 
Maximara said:
I use near bare bones Safari on an old 2013 iMac with a NVIDIA GeForce GT 750M 1 GB and this behavior still shows up from time to time.
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I think we can conclude that it only affects 2013 iMacs. MacRumors doesn't seem to be the only victim.
talk.macpowerusers.com

New iMac or MacMini?

my iMac is starting to give some flakey issues. Safari locks for a while - then its fine. Weird screen artefacts on Safari. General slowness. A clean install might alleviate some issues but it’s a 2013 model so I’ll probably just wait another month or so - see what comes.
talk.macpowerusers.com talk.macpowerusers.com
 
Been having these same issues the last month or two. Running Safari 14.1 on a late 2012 iMac running 10.15.7. It's intermittent & will usually go away after refreshing or opening the site in a new tab/window. Weird that it's only happened here on MacRumors though?
 
DemonMF777 said:
Been having these same issues the last month or two. Running Safari 14.1 on a late 2012 iMac running 10.15.7. It's intermittent & will usually go away after refreshing or opening the site in a new tab/window. Weird that it's only happened here on MacRumors though?
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I did ultimately observe it on other sites too, but rarely. For whatever reason it's been much less common (for me at least) at MR of late as well.
 
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I don't know what happened on my end lately, but MR now does this 50% of the time I visit, even quitting Safari and starting it fresh loading MR as the first site leads to corruption.

EDIT: Weird. I came here because just recently it was corrupting 100& of the time I load the main page - yet when the AppleTV+ article (Apple to Reduce Apple TV+ Free Trial to Three Months From July 1)
was posted while I was reloading, it completely stopped corrupting the page and won't do it again.
 
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It is now happening in Safari on MR almost every time for me, too. There are a few other websites where I run into this issue so it isn't an MR only thing, but the frequency is much higher here than elsewhere.

It is still interesting that almost all of us are using 2012-2013 iMacs. With the exception of Safari, my 2013 machine is running as great as it was the day I first turned it on.
 
Yes, same here.

Either it's an NVIDIA bug Apple doesn't care to fix, or it's a hardware failure of some kind. Though nearly every issue I have is with MR and very few other sites, and no other browser has ever shown this issue.
 
rworne said:
Yes, same here.

Either it's an NVIDIA bug Apple doesn't care to fix, or it's a hardware failure of some kind. Though nearly every issue I have is with MR and very few other sites, and no other browser has ever shown this issue.
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Strangely I haven't see this behavior in about a month and I would see it at least once a week. I suspect it was a weird combination of browser and OS version.
 
I have similar issues on my 2014 15" MBP. After I upgraded Chrome (I do not use Safari). Started with switching the thumbnails of the Youtube channels, two weeks later the entire screen came up with those triangles but only in the browser and not with Macrumors. I believe I restarted my computer and I am getting just the Youtube issue still but that is it. I am running Mojave.
 
I have the issue where when I'm in the MR forums Safari changes to "mobile" mode, or at least it looks like the pages are designed for smaller mobile devices like the iPhone. The home page though still displays correctly.
 
Upgraded recently to Safari 14.1.2. I never had this issue until now. 😢
I have a Late 2013 iMac, running Catalina (10.15.7). 16MB RAM, NVIDIA GeForce GT 755M 1 GB
(*Waiting desperately for the new larger iMac so I can finallllllly upgrade.)
 
You've never seen it until now? That's disconcerting.

If it were an NVIDIA bug, I'd think everyone on Catalina or later with an NVIDIA GPU (2013-or-so Mac) would have it to one degree or another. My observations:

  • MR to me is the primary source of this issue, as it can be readily repeated here, but there is no sure fire way to get it to do it on-demand.
  • Happens on the main page of MR, not the forums.
  • It occurs on a random page load, and once it happens, it's there for good until you restart Safari. Other tabs, if open are not affected. If you go to MR on any of the open tabs, the issue will appear there too. Other websites are not an issue.
  • I've seen it occur with high frequency (nearly 100%) at times and when a new story is posted, the issue suddenly goes away again.
  • A fresh restart of Safari is not a guarantee it won't happen again, it can happen on the first page load or MR after restarting.
  • CPU/GPU temperature has no effect on the issue. I've run GPU benchmarking to stress the GPU and it can run overnight without any issues.
  • For me, everything was fine until Catalina was released. This problem happened coincidentally with Catalina.
  • Different versions of Catalina/Safari will make it happen more or less frequent.
  • Another Mac in the household does it far less often (same model as mine, but an i5 instead of an i7). This Mac does not visit MR though.
  • Reinstalling Catalina did not solve the issue
  • The problem seems limited only to Safari. I've seen Chrome glitch out once, but that was only one time.
  • Enabling/disabling browser features in Safari's developer mode does not have any effect on the issue (once it has occurred).
  • Clearing the browser cache has no effect on the issue.
  • Problem occurs primarily on MR. I've seen it happen on other sites, but it's very rare. bleeping computer did it to me last night, the first time in several weeks I've seen it on a non-MR site.
What bothers me is that other people are coming in from time to time mentioning it as a new issue. This means:

  1. Some hardware failure has occurred (or is in the process of occurring). I thought the GPU stress tests would uncover that, but those are typically 3D tests, not 2D tests.
  2. It could be something that is getting set or corrupted in user accounts: Ever load the Safari Previews? Beta versions of Catalina? NVIDIA CUDA drivers? Xcode? etc.
  3. Very little discussion of this outside of MR. So it may be a website-specific issue that triggers the bug? This is my current line of thinking.
EDIT:
Bleepingcomputer is now corrupting 100% of the time I reload it without restarting Safari. Odd thing is, I visit MR from the corrupted page and it fixes itself. Back to BC and it corrupts again.
 
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