Well, i just completed the second character in which the Thieves guild questline glitches or something. It involves Karliah not returning to nightingale hall, not open a portal to twilight sepulcher, the hey going missing all together and Karliah herself going missing

Ive completed the extra jobs before and after finishing the main questline, Ive waited many hours to let the ai get in place and still nothing happens. However i did find Karliah back in snowveil sanctum, where you first meet her.. She is in her NG armor still behaves however as if she is in nightingale hall, but no extra dialogue options

Brynjolf also gets stuck in the 'sorry, got important things to do' line. Im lost and any help or a possible solution will be appreciated, though i feel as if this byg is so common, taht no one recognises that it even is one

I got the same thing. =/

Wait, is this after you completed the TG questline?

I didn't have this issue. I'm guessing it's because you didn't finished the re-building the Guild before ending the main TG quest.

I did that, on my second playthrough and it still has this issue. UESP wiki reckons it has something to do with having to do enough radiant quests for Vex and Delvin, but doesn't specify how many.

I'm going by memory but, on the official guide, it's written that Karliah moves to the hall right after trinity restored. What I got is an empty sanctuary but inhabited (candles are lit again, some furniture moved, etcc..). Karliah should also show up in the Cistern during the final 'coronation' of the player as new guild master.

there are two threads about this already (including mine)

Actually I 'm talking about the period after the Guild Master Ceremony. She says she'll settle in Nightingale Hall in the Nocturnal sanctuary, but she doesn't show up after the Guildmaster Ceremony. I tried moving my character to her in console and she apeared to be in Snow Veil Sanctum. I even tried moving her to Nightingale Hall, but she just walks out goes back to Sonwveil. She must be considering to become a draugr.