Safari Upgrade causes problems with many websites

There was never a real fix to download. The solution was merely to reinstall the existing Safari version. You can try the download, you will not destroy anything...

Sorry for your troubles, Pablo, but good to know we're not alone. That was a hugely disruptive problem, so I ended up reverting to a TimeMachine backup. (And that too with some problems–including difficulty getting the restore to be recognized as a valid startup disk, now hopefully mostly resolved). I will not update Mojave any further until I'm confident this has been fixed by Apple.

After I posted the installer-link for the reinstall, all websites were retrieved without errors. It mitigates the mentioned symptoms (after today only) of 99% of visited websites with Safari 13.1 on High Sierra. I can't believe it: The only site that hasn't worked for me so far (date 16.04.2020):

https://www.apple.com/de/iphone-se/

Safari 13.1 on Catalina and Chrome in general works fine. :-/

I downloaded the Safari patch and ran it. I happened to be on an https page which wasn’t working and about 2/2 to 3/4 Of the way thru the problem fixed itself and the broken page fixed itself.

nothing special was done. I will say prior to the patch I had already cleaned cache and cookies but not sure if those had any affect.

I've tried everything, including 2+ hours of chat with Apple folks but continued to have the same problems. Now typing on new Mojave OS and so far everything seems to be working - keeping my fingers crossed.

Hi I did a Mohave reinstall and solved the issue for now.

I was having this same issue, since updating Safari yesterday! I tried everything to get it resolved and spent ages online to Apple support chat! Just downloaded and reinstalled and this has fixed the issue!

Thanks so much! Awesome!

This is the same Safari package that has already been installed.

It should not be, but sometimes the order of installation is crucial. On my MacBook - first Safari was installed then the security update (I suppose with a Java update). I suppose also if the java update had been updated first and then safari, the issue would not have happened.?.

The easiest way to get the package is /var/log/install.log (a large log-file). Other way is the Software Catalog com.apple.SoftwareUpdate.plist or you manage the software update in the terminal (command softwareupdate -l = list, then check Drive/Library/Updates)

Same issue here. After reinstall Safari13.1HighSierraAuto.pkg and reboot, the mentioned above issue is solved on my macbookpro 8.3

B BM .....thank you,...I used your method of command R and it fixed the problem without my having to download from a link.

No uninstall, only do a reinstall. See below.

I posted a new download link for Safari 13.1.1

Have you tried reinstalling Safari after reinstalling the whole operating system? When you answer with 'yes', then you should try installing Mojave.