I have been trying to finish the "A Tangled Web" quest for two days, but I have a problem. When in the Nocturne Theater, I can place the webcam easily enough, but I can't get to the computer because the guards do not move at all, but just stay in one position. I have tried reloading several times, and have even re-installed the game, but to no avail. I have researched on the web and watched videos, but every video and walkthrough states (or shows) the guards moving around on the stage. Can anyone please help me? Is there a work-around for this? Thanks!

I realize this post is close to 2 years old, but I just ran into the same problem. I found that it is possible to pass the guard if your sneaking is at 9. For example, my character's dexterity is 2 and stealth is 4. That puts my sneaking at 6. I then used bloodbuff to boost my dexterity to 5 and get my sneaking to 9. Then by crouching along the left wall I passed the guard unseen.

NPCs not moving is usually caused by making changes to the map and not starting a new game.
Maybe autoupdate from Galaxy?

Repairing the game solved it for me.

UPDATE: But now the library card is not spawned...

Post necromancy, yay!

I'm having the same issue, but I'm playing with the Unofficial Patch and I'm wondering if that's what broke it. But if I repair the files, I'll probably break the game and will have to restart or at least repatch it, so I guess I'll just ignore this quest.

The funny thing is, I can hear the guard's footsteps, but he doesn't actually move. And I checked, the character's line of sight is unfortunately intact.

I've had similar issue with the stealth in the Imalia mission - in there, one character was stuck in a loop of two out of three positions and only a few reloads initialized his actual path.

EDIT: upgrading my Stealth to 8 allowed me to sneak my way past the inert guard using the wall on the left. It required using Blood Buff and spending points I'd prefer to spend otherwise, but... it is what it is ;)