Clients just don't handle OTR messages nicely if they can't decrypt them
Suppose I start an OTR conversation on Client A with somebody. If I view the IM pane with Client B (logged into the same account), things will generally not work nicely. For example, there won't be any indication that Client A already has an OTR conversation going (I won't even know there are messages from Client A - or the buddy). I think sending messages doesn't exactly work either. I haven't tested this enough, but I know the experience isn't user-friendly, and I think it's relatively easy to miss messages / not realize that a conversation isn't going through. We should test it more to be sure of what exactly happens, and we should think about how to cut down on the wonky behavior.