Rock Foesbane

Anyone else have this problem? No one responded in tech support, so how about someone helping me here, please. I can't interact with the crystal though I've been told to as I'm at that point, so I can't finish the whole story; which is really weak.

Krakens dead, signal was given, but there is no option to interact with the crystal like I did to enter the lake prior. What's wrong? Is this another bug? I'd be pretty upset if I couldn't finish this whole expansion and end it so I can finish the main game.