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At Lethian Crossing, with Lorent and Aulus, I see no results (other than an increase in Tulan wrath). I've handled the dialogue in a number of ways:
1) asking both for double bribes
2) asking one for single bribe
3) asking one for double bribe

In none of the cases, does my money change. Nor in my subterfuge level.

Can anyone else confirm this?
Very odd indeed. Seems like the dialogue script doesn't fire properly.