Video and audio problem after upgrade of Sierra.

After that each OS upgrade that I know it's going to be a few problems, so I wasn't surprised when this happened with Sierra. Most have been quickly resolved by common sense, but I have a biggie that remains. Mainly, but not only, it occurs during playback of videos and translates into a serious attack.

When you use: -.

Google Chrome Version 53.0.2785.116 (64-bit);

When you watch a video, I hear a short hissing sound with a rising intonation (or sometimes 2 these sounds) then the text is added to a search bar (sometimes this text contains the words drawn from what someone says in the video!), or the video play suddenly disappears and a new tab opens and opens a page of Google apps. By clicking on the symbol left back page Apps and re - opens the original video that starts playing from the beginning again.

This happens also in Chrome when it suffice to read a web page.

In Safari 10.0 (12602.1.50.0.10)

When occurs sound even watch videos in Safari 10.0 (12602.1.50.0.10), and the small text boxes appear at the top of the screen for a few moments contains comments such as "Hide this app", or "Undo that" before disappearing again.

and audio in iTunes 12.5.1.21

The same thing is happening in iTunes or when playing the iStore clips or songs in my library. The same small text boxes are displayed at the top middle of the screen containing cryptic messages such as "click 308' disappearing quickly. Sometimes the ' find and Replace window appears with more cryptic phrases in ' are are are ' not found! This occurs every 3-4 minutes.

When you use Pages 6.0, a doc Pages will disappear and will appear in the folder from which it was opened. Or Graphic Converter 8, an image suddenly disappears and will open the Finder.

I ran Etrecheck that says everything has been "excellent". I ran disk utility: first aid, who said there is corruption, he couldn't fix it and is running in recovery mode. I did, and the glitches always come back.

Summat is false and I am not enough techno to understand (or maybe even explain it very well).

Anyone bed this litany has an overview of what happens with a recourse?

Thank you very much

Graham

Sorry, should be added the following: -.

MacBook Pro (retina, 13 inches, end of 2013, recently upgraded to Mac OS Sierra.

Processor 2.4 GHz Intel 15 8 GB memory

Grahan

Tags: Mac OS & System Software

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