When entering full screen in safari video distorts

So this issue has been happening for a few months now. I was in the beta program for Sierra, and High Sierra OS when this problem started. I un-enrolled from the beta program and installed the regular version of High Sierra and the problem went away. After an update a few days ago the problem came back. I'll try to explain this the best I can. when i'm on youtube or other websites where full screen is available the video will basically go diagonal. It doesn't always happen but it does about 60% of the time. if i move the cursor it will look normal but then goes back to being distorted. It's really annoying, I reset the PRAM thinking that might help, but it still happens. It was fixed after I initially left the beta program and installed a normal version of Mac OS. But now after the last two updates 10.13.4 the problem has come back. I've also noticed on youtube if i change the resolution to 1080p, or 480p the problem usually goes away, it's mainly on 720p videos that the issue happens. I tried to take a screen shot but it did not capture the problem correctly, so I had to take a picture. If you need anymore information let me know, thanks again. User uploaded fileIt's really frustrating and any help would be great!

MACBOOK AIR (11-INCH, EARLY 2015), Mac OS X (10.1.x)

Posted on Apr 25, 2018 3:34 PM

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Posted on Apr 25, 2018 7:42 PM

Try setting up another admin user account to see if the same problem continues. Also try the Safe Mode.


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If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown.

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27 replies

Apr 29, 2018 8:14 AM in response to scotteffone

I downloaded chrome and and tried playing the same video, it definitely works fine in chrome. I did find that changing my resolution to 1280x720 did work for me as well.


I really don't know how to report it to Apple. I'm sure someone in the forums here knows how to do that. I was in the beta program and they give you a feedback app that collects data and reports the problem to the developers. I actually just checked and I still have the feedback assistant app. I'm going to try to send them the issue we're having. I'm not sure if it will work since I'm on a regular version of MacOS. I'll report back in a little while with what i find out.


Also I agree it seems like a problem with Safari. The weird thing is that this problem happened while I was on a beta release, and I got so fed up that I reinstalled a regular version. Everything was fine until a week ago with the last two updates. I searched the internet for months trying to find if someone else had the same problem. I feel a little better that it's not just me, I thought maybe I broke something.

Jun 1, 2018 5:53 PM in response to bgwss42

I have just noticed the same problem on my MacBook Pro 2015 - the difference is that I am getting it on iTunes when watching certain movies in full screen. Just like you, if I move the cursor, the diagonal distortion disappears but then returns a second later. I have tried setting up a test account, resetting pram, repairing permissions etc. all to no avail. I notice that the distortion never occurs if the movie is playing at anything less than full screen. Also it doesn't occur if I open and play the movie with Quicktime instead of iTunes. Not sure what else to try but my main worry is whether or not this could be a graphics card/logic board problem. I really hope not!

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When entering full screen in safari video distorts

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