Mystery Cookie in Opera 10, R.C. 2.
 

Running Slackware 12.2.
Posted the message below over at the Opera site, but there hasn't been a response.
As noted in the text below, until I started researching this problem I had never been to the site that is planting the cookie, or any possibly related site.
The sequence of events appears to be that I go to a site and if I check the cookie manager in Opera at that time there is only the cookie for that site. When I leave the site and then
hit "Delete Private Data," from the "Tools" drop down menu,
and then check the cookie manager again, there is a session cookie for the site named in the text below.
This has to have something to do with Opera as this does NOT happen in SeaMonkey or Konqueror.
Thanks for you help.
***
Cookies and Opera 10, R.C 2, build 4583.
Running on Slackware 12.2.
I Installed/upgraded to build 4583 earlier today and just notice a problem with cookies. Well, one cookie in particular. I don't know exactly what is causing this, but it does not happen in other browsers.

I have Opera setup to only accept cookies from the sites and I visit and to delete these cookies upon exiting Opera.
I just notice a short while ago that it doesn't matter what web site i go to I get a cookie from,

http://www.keikoo.com.

If I go to that site it automatically re-directs to a site for a husband and wife realty office in a city about 50 miles from where I live,

http://www.okuborealestate.com/

At first I thought it might have something to do with Turbo as Turbo seems to run out of a server about 80 miles from here which is 30 miles beyond the location of the realty office. I turned off Turbo, but the problem remains.

When exiting Opera this cookie is not deleted and has to be deleted manually each time.

Any help solving this problem and getting rid of this cookie, permanently, would be greatly appreciated.
How can something like this even happen? Has Opera allowed this to happen as some sort of income source?

I would hate to have to dump Opera and M2 over this.

To repeat, this problem does not exist when using other browsers, so it is somehow related to Opera.

Thank you for your help in this matter.

OK, it is definitely related to the "Delete Private Data" function.
If I "delete private data" and then go and check the cookie manager, there is a session cookie for the site named above.
Looks to me like someone is spying on my activities or I'm a just paranoid. ;)

Is there any way to tell Opera to block cookie from this site? Firefox has such an option, does Opera too?