We also still have the same problem. It was supposed to be fixed with the last update of the mobile client's (have you unistalled the mobile client's and tried reinstalling them from scratch). We still can't get it to work. Also, particularly with mobile clients there needs to be a user initiated way of unsubscribing from call queues. At the moment you are either online and availiable thus any call queue you are a member of comes to you or you are not available - period and calls to your direct line / SfB address that are not call queue originated cannot reach you (although maybe the workgroup privacy option could be used to control this to a certain extent as an interim measure).
The system needs for example to allow users to toggle their membership of a particular call queue on and off (covering reception for someone else while they take a break) - otherwise, if you have a busy 24 / 7 call centre, if the person is a member of that call centre call queue they are standing in front of a fire hose of calls 24/7 with no way to shut it off when actually they may only need to be a member of any particular call queue for an hour during peak traffic time. Another example is if it only makes sense for them to be a member of a call queue if they are physically on site. First aid is a good example of this - set up a call queue as a kind if internal 911 - it will call all first aiders on all devices at the same time . Excellent !! However, it is not much good if the first aider you are connected to is working off site today.