The help file you were looking at is for Opera 12 - it won't do any good with current versions.
If you mean their homepage www.shutterstock.com ... looks okay when not signed in, so I might suggest clearing cookies. If the error occurs when you sign in then try changing cookie settings for that site.
Hi friend. I have the same proble. I am trying to load this website http://aroma-photo.com/, with Opera but I dont know what happens. I think it is problem of JS or CSS, who helps me... maybe this website have some error.
I can also confirm that this behaviour...looping updates...also appears on a mid-2010 MBP running OS X 10.10.5 . I'm not familiar with the setup of this MBP but the only thing shared between all these machines is the wifi network...on a Time Capsule, purchased in September 2016, running on a 5GHz network. I'm wondering if there's a setting there that might be involved with this condition.
Well, this bookmarks are now Opera-Bookmarks, except that they are in the "imported"-folder!
You may create your own bookmark-structure (folders included) and move the bookmarks from the "imported"-folder to the new locations.
At last you delete the empty "imported"-folder and now you have your "genuine" Opera-bookmarks!