Hello,
When playing with my friends, I'm always getting this bug when it comes time for party interactions. Whoever is going to talk before the companions turn gets skipped as soon as they select their dialogue option, and the companion voices their dialogue. This feels pretty frustrating, like your character is a mute or his existence doesn't matter. This is also with or without mods on multiple separate games.
There is currently another thread but I felt it may be in the wrong section and will provide a link for it here.
http://larian.com/forums/ubbthreads.php?ubb=showflat&Number=614937