Opera 36 on Win XP SP3
I have been tidying up and deleting some bookmarks and copying some back from Vivaldi individually.
I find that with two bookmarks they will not exist together in the same folder or even with one of them in a sub folder. When I put the second one in it deletes the first one. It does not matter in which order they are inserted. The bookmarks in question are for Via Michelin (Maps) and the other for Speedcameras information.
Very strange, any ideas please. The sites are just being opened and made favourites in the normal manner

Sorry to be negative but so much for auto updates over which you have no control. There are enough problems without this. Its another reason I stayed with V12.17 and makes me liable to stay there.

Many thanks Blackbird71 that post was most informative and could account for browser variations. It looks as though we are getting somewhere and helps me understand the situation better. Unfortunately TLS1.2 did not help. It is now enabled along with SSL3 and TLS1, however when looking at details only SSL3 TLS1 is shown ,no TSL1.2. Whether I need to reinstal the same version over the top or update to the next one from old versions to get these I do not know. Checking for updates does not install them, it only wants me to accept the latest version. I disabled auto update som time ago as it was a nuisance, popped up as I was clicking a web page where it jumped up between and started downloading. It was stopped promptly.

The following is a typical entry from the Error Console with a yellow triangle and exclamation mark.
Linked-in stylesheet.
[29/12/2015 21:09:04] CSS - http://www.trainvideodepot.com/css/tooltipster.css
-moz-transition-property is an unknown property
Line 149:
-moz-transition-property: opacity;
Other than it relating to cascading style sheets it does not mean much so is probably irrelevent.

I have been an opera user from the very early days but stopped updating like many others,when the big change was made after this version. I looked at either V15 or V18 on an Android tablet and did not like what I saw.
As I said previously bookmarks had gone and neither could you alter the names of sites in the new setup. I may look again providing the new Bookmarks facility is as good as the old one. Thanks again.

Hello
Thanks for the replies so far. I stayed with Opera version 12.17 as I have hundreds of bookmarks and did not like the new system when they did away with bookmarks and everything had to be fitted in speed dial which was impractical for my needs. 12.17 meets all my requirements and this is the only problem I have had.
I note that the authorize.net icon/logo on the website in question trainvideodepot.com is there on the home page but when you return to that page it has disapeared which raises my suspicions. I gather now that a friend has also had this problem of a certificate warning also using Kaspersky but probably not opera. Strangely however this only happens in Opera and not with Firefox or Vivaldi if I can mention such names here. Hence my suspicions it was raised by Opera. Somehow two entries for authorize.net had been loaded into my Local Settings\Application Data\Opera folder which in User was hidden as were protected Operating System files. One was an .png file the other a .idx. These have been deleted and had not returned but in Opera the warning still arises I did not accept the certificate, rejected it and closed the browser. I now need to check these again having seen the problem arise once more.

Hello
After looking through many screens and doing a search this seems the nearest post to my question. I am trying to access an American site but Opera brings up a security warning "Server Certificate chain incomplete. verify.authorize.net". I assume it must be Opera raising this as other browsers do not show it and Kaspersky Security applies to all. This does not show in my certificte management and I do not know anything about this company so have not accepted it as I am not sure how genuine it is. Its logo (click) button now appears as a payment merchant on the web site I have dealt with satisfactorily several times in the past over a number of years. Does anybody know of this organisation and if it is safe to accept please?

Many thanks lando242 for your help.
I did not want to be up the creek without paddles as my total bookmarks must be similar to yours. Its a pity Opera do not make this clear in their features about the update. I have been a user for a great many years but despaired the way things looked after V12 as it was a severe loss of features for my way of operation. I hope the last stable release is as good as what you have in 30 as far as bookmarks are concerned as I do not know when they were reintroduced,
Thanks again.

I am wasting a lot of time trying to get an up to date picture of Bookmarks on the latest version 28?
what I want to know is there a proper bookmark system seperate from speed dial capable of handling a lot of bookmarks like we had in V12.17? I have several hundred on different subjects and one alone has over 100 entries which speed dial does not cater for so I stayed with V12 where it was also possible to alter titles to be more meaningful. After V12 it was a disater and best avoided.

Do we now have a sensible answer?
Do I stick with V12 or move to something like Vivaldi or is V28 more sensible.
I am on a Windows Desktop PC

Search results for “Opera on Android tablet. Version 12.10 ran well until afew months ago. Now Google dearch provides list but only one site will open. Installed Opera 24.0.1565.82529. This worked perfectly until latest sytem upgrade yesterday. Now the same applies, you can only open one URL. I note there is now a request to log in for all google apps, is this the reason”