Solution to Virgil standing in the trees at Tsen Ang

When you leave the dark elf city, Virgil tells you he has to go somewhere to do something, and runs off. Officially that's supposed to trigger a plot event wherein the next time you see him, he's in a basement at the sobbing onion pub in caladon (alive if you went there and killed his would-be murderers before you went to the panarii temple, not so if you went after.) There's a seemingly random bug though that makes him get stuck in the trees outside the doorway of the dark elf city, usually hidden in the trees. To get around this bug, keep walking 'through' Virgil, and hitting right-click when you're on the same square so you stop on top of him, forcing him to walk a square. If you do it enough times, eventually he disappears, thus triggering the plot events in the basement.