I'm beginning to think there's something about the way I'm playing the game that is stopping me from completing minor faction quests, as I have yet another example with no dialogue options (see below). I think that's four now, two for Pariden, one for the Ice Lords, one for the Frozen Realm.

This one makes slightly more sense as it's a quest for the Frozen Realm, and it's specifically to commit a prank against another faction, the Yeti (Ice Lords). I have quite a lot of favour with the Yeti, so it's odd that I'm doing quests against them. This has made me wonder if there is some game mechanic which is supposed to stop you allying with two opposing factions. Am I not supposed to be able to do quests and ally with Frozen Realm and also the Yeti? The other thing I've wondered is that both The Frozen Realm and Pariden have equal or greater amounts of favour with the Sorcerer King (see diplomacy screen below). Could this be causing problems?

Whatever the cause is, it's frustrating to say the least, as I have to kill the game each time I get one of these "no dialogue to progress" screens, as well as making it more difficult (impossible?) to ally with some factions.