I noticed my hubs that are sleepers no longer have a "link to this" button on the bottom so we can insert our referral trackers. Is this a glitch or is this something to do with the sleeper hubs being activated?
You can still link to it and insert your affiliate tracker, HubPages is just making it harder for us. There is no Google penalty for linking to something that HP has deemed idle. HP's idea of quality is different from Google's so if your hub is well-written and contains useful information there's no reason not to link to it.
You can help the HubPages community highlight top quality content by ranking this answer up or down.