You are welcome. Safari/Preferences/Advanced - enable the Develop menu, then go there and Empty Caches. Then Safari/History/Show all History, select the web site, and hit delete. Quit/reopen Safari and test.

o to Finder and select your user/home folder. With that Finder window as the front window, either select Finder/View/Show View options or go command - J.  When the View options opens, check ’Show Library Folder’. That should make your user library folder visible in your user/home folder.  Select Library/Safari/Bookmarks.plist.

   If you have not done this already, please try these standard troubleshooting steps.

   1.  If Safari is slow, stops responding, quits unexpectedly, or has other issues

        https://support.apple.com/en-us/HT203353

   2. Delete Caches and test.

      Close all windows and quit all applications.

      Hold "option" key down and click "Go" menu in the Finder menu bar.

      Select "Library" from the dropdown.

      Library > Caches > com.apple.Safari

      Right click the com.apple.Safari file and select "Move To Trash.

      Close windows and relaunch Safari.

  3. Remove Cookies and test.

      Safari > Preferences > Privacy > Cookies and other website data:

      Click the “Manage Website Data” button.

      It will take a while for cookies and caches to load.

      Remove all cookies except  ones from Apple, your internet service provider and banks.

      https://support.apple.com/guide/safari/manage-cookies-and-website-data-sfri11471

  4. Disable Extensions and test.

      Safari > Preferences > Extensions

      Select and disable all extensions and test.

      Enable Extensions one by one and test.

      To uninstall any extension, select it and click the “Uninstall” button.

      https://support.apple.com/guide/safari/use-safari-extensions-sfri32508/mac

  5. If this doesn’t help, please run EtreCheck and post the report here.

       https://etrecheck.com

Hi there,

as you can see from the report you have adware problem which you should solve before any further troubleshooting steps. I would personally use this: http://malwarebytes.com/ in the free version which do not requires the installation of any background processes which can makes problems to the OS itself.

Then I would make sure that ZipCloud is fully removed because I see missing references (the launch agents in you library, you can contact them here to get support: Zip Cloud - Help Center).

After that, keep in mind that with 4Gb macOS High Sierra is not the best so try to not keep opened too many stuff and you also have the mds process consuming lots of CPU power: make a research in this forum to see how other people solved.

Thanks for your help everyone. I didn't find anything wrong with my system. However, I did solve the problem. Somehow, Java got turned off. So, certain web pages were not working on Safari, but were working on other browsers. With me, updating leads to tinkering. So, it was probably me.

Problem solved!

Thanks!

From an other link

Clear cache, cookies and history in Safari:

1. Open Safari.

2. Click the Safari menu, and then click Clear History.

3. In the drop-down next to ‘Clear’, select all history.

4. Click Clear History.

Hi,

Might be a cache issue ...

Open the Finder.

From the Finder menu bar click Go > Go to Folder

Then copy / paste the following:

~/Library/Caches/com.apple.Safari

Then click Go then from the Finder window that opens move the Cache.db file to the Trash.

Then quit and relaunch Safari and try exporting to PDF.

As I wrote earlier, keeping the macOS upgraded is the way to prevent these kind of problems if you can.

Don't kill the Safari app? In fact, don't kill any app. There is no benefit to killing apps, and some good reasons not to.

We were all correct, you, ckuan, and me. I back pedalled by re-installing my previous version El Capitan V10.11.5, and my Safari reversed to V9.1.1. That indicated this Safari version to be part of the OS installation.

I then upgraded again to OS X V10.11.6, which also included Safari V9.1.2, part of OS installation.

At this stage I had never seen a separate offer on the App Store for a Safari update, and a search did not come up with any result either.

I then installed the security upgrade 2018-001 for El Capitan (there are several security upgrades by that number for other systems). After that installation, the separate Safari upgrade for V11.0.3 showed up in the App Store. I installed it to bring my system up todate.

Thanks for all your input.