I'm trying to find out if anyone has experience the following situation and if they have found or know of a way around it, or if I've missed something critical in setting up a key? I haven't used Lucid for a while, so maybe the latest versions don't produce this behaviour? Any help or pointers would be much appreciated.

If you have a multi-state character, it is possible that one or more of the states applies to none of the remaining taxa. It would be great if under these circumstances the particular feature state or feature states did not appear as a choice in the list of options.  

For example, say you have 3 possible states for the hind claw of a strange creature.

1. bifurcated

2. single

3. absent

And there are 3 strange creatures left as possibilities: Creature A has a single claw and B and C do not have a claw. Therefore, none of this particular remaining set have a bifurcated claw.  If you choose 'bifurcated' all creatures disappear from your list which is very disconcerting. It would be great if only 'single' and 'absent' were presented as options preventing the possible sudden disappearance of the whole remaining set. 

Say the opposite is true and Creatures A, B and C all have a bifurcated claw. If you select 'bifurcated' nothing happens which is as disconcerting as the whole of the remaining taxa disappearing. If you select either of the other two options, the all the remaining taxa once again disappear. It would be great in this case if the hind claw character was automatically eliminated from the list of features the user could choose from. 

Cheers Anne