Can you expand on this a bit? If you remove the Ideas category type, which controls whether the category topics can be voted on, then it makes sense that you can no longer vote on these topics.
Or are you saying that topics in categories that you used to be able to vote on can no longer be voted on? If so can you please give some example categories & ids? In your site’s rails console you can do Category.can_vote?(cat.id) to see if a certain category should be able to vote.