There's a game-breaking bug with Zakira's first quest.
After I started the Gauntlet quest, I went back to the guild and saw the "suspicious request" pop up again. Thinking I'd unlocked the next Zakira quest I clicked it, noticed it just had the same dialogue and shrugged it off, and went to the manor. Turns out it completely locks you out of going to the manor after that, since the game won't let you without the stone, but the monster you've killed to get the stone is already dead.
Essentially, the game lets you pick up the Suspicious Request quest while it's already completed.
I had this issue in 1.7.4 but I just updated and it's still there.