Hi,

I have a site with Polish as the default language. I enabled Localized Content and translated all pages to English. 

I tested 1 of the page and could successfully switch languages on that page. Then, I needed to rename the page name on the English version. After renaming it, I was no longer able to switch languages (clicking on either language flags kept taking me to the Polish page).

Anyone encountered this issue before?

That's whay I thought too, but I'm guessing something is getting changed as well when the page name is updated.
Strangely, I've noticed that when I hover over the US page link, the correct URL appears at the bottom of my browser, but when I click on it, it redirects to the Polish version. Also, when I try to view the US page from Page Management, it redirects to the Polish version too.

I'm honestly not sure. How can I check that
I'm running version 08.00.04 (upgraded from 07.04.01 with no errors, although I think that was also upgraded from an older version).. Is there a way to check the history of DNN versions upgraded on the site; I've read that Advanced URLs is not activated by default for upgrades of earlier versions to DNN 7.1

Yes, it's still marked as translated. And Advanced URL is already enabled.

Current page URL in Page Settings is "/Privacy-Policy-en-US" but page is redirecting to "/Polityka-Prywatności". I checked Page Settings > Other Settings for Page URL redirect and it's set to 'None'.