This is a strange one indeed. I noticed my PR1.2 version that was done via NSU was version 10.2010.19-1.002 (US Version). I am in the UK.

So I flashed my N900 with the UK Edition and now have 10.2010.19-1.203.1

I have not restored any backups yet so the phone is clean and have no User Agents loaded. On one of the desktops is the OVI bookmark and when I tap on it, it goes to
http://link.ovi.mobi/n900ovistore and in a split second it changes to:
http://maemo.nokia.com/ovi-store-promo/ which is the exact Promo website I saw with my original PR1.2 firmware.

The shortcut in the menu goes to the same place.

On the N900 if I goto http://store.ovi.com I then see the following message:

[green ovi banner at the top of the page]
I have cleared Browsing History, Cache, Cookies, Saved Passwords, and authenticated sessions, and it is showing me the same page.

I typed out https://store.ovi.com and it loaded the same screen above with the Lime Green header.

Not sure what else I can do!