Just discovered that clicking on a link for a group that is hidden results in a CC crash. Try hiding tags then clicking on a tag. Boom.
My assumption is that I should not make links for groups that are hidden. The upside is that CC won't do weird things like crash. The downside is that the items will be "mysteriously" not linkified sometimes. The mystery is caused by a user action, but that doesn't mean much when it comes to support contacts.