Hard to believe that I was the only one that reported this issue, which seems to coincide with the major DoS attack of last week... it started Friday and corrected Sunday. (although not directly related to Opera).

As an update, I did a Restore Point recovery from a few days ago and Opera is now working again.

This started yesterday... when I load Opera (latest Win 10 64-bit), it loads my default tabs and in 10 seconds or so, shuts down and reloads continuously.

I uninstalled Opera and installed an old v12 I had. Although when I run this, it goes to an Opera web page, I soon get many, many pop-up Security warning windows saying "Servers certificate chain is incomplete..." on any site I try to go to.

Any suggestions?

This means a lot coming from someone who can't seem to operate a forum post...

Do you have any extensions installed? Please list them here. Also, try disabling all of the extensions, relaunching the browser and viewing the videos again.

This worked for me... I disabled all my extensions and brought them on one at a time as I tested. "Blur" was the one that caused my problem. Leaving it disabled, I am now able to view the Facebook videos embedded in my various forums.

This may be because I am not logged onto Facebook... and haven't been for a long while.