What other mods are you using? I've used the Dark Apprentice Holowan Consortium twice already and did not experience any troubles, so I doubt that it is responsible for the problem.
Do you have a savegame before you arrive at Citadel Station? You could try reloading the game from there and see if it works. In any case, you'll need to do that if you want to use the Skip Telos mod, as I believe it only works if you haven't done any missions yet on Telos.
- Star Admiral