Need help with Mannox's vault

Okay, I completed the incredibly annoying puzzle required to find Mannox's vault-thingy in Roseborough, I obtained the password ('truth', as far as I know), and am now standing in front of the entrance to the tomb/vault thing. How, exactly, do I enter it? Clicking on it doesn't do anything; in fact, it doesn't even highlight when I mouse over it, and I am incapable of interacting with it in any way. Is this normal, or is it a bug introduced in the latest version of the Unofficial Patch?

 

You're probably confusing it with something else. Here's what it looks like.

Just walk up the coast and you will eventually find it.

 

10:38 with the last UAP the quest worked. you should check the regular notes in your journal and / or speak with Alexander of the Caladon Temple a few times, as finding the (ancestral) tomb is a quest from him. note that this quest doesn't appear in the journal. maybe you need to talk with all the Temple NPC's a few times again, as the scripting there is IMHO slightly messy, specially if you do things like exploring the Caladon sewers before requested to do so.
10:41 edit: oops. I need to type faster...

 

Yeah, I just mistook it for a vaguely similar-looking bit of scenery on the Roseborough coast. Thanks.