Okay…
We’re currently on the US Forums. This means that when you click on a poster’s name and/or avatar and select View Profile, it will attempt to take you to their US Armoury page.
In your case, that means it would try and take you to…
https://us.diablo3.com/en-us/profile/prempeh-2627/
…which will fail to load. That’s because, a few weeks ago, Blizzard made a change to the Armoury site and the URL now includes blizzard in it. The correct URL for your US Armoury page is…
https://us.diablo3.blizzard.com/en-us/profile/prempeh-2627/
The fact that the Forum’s View Profile links now point to incorrect addresses was reported back in February…