I believe with this new Waypoint Update, it’s gone. On the old Waypoint, I used this feature on a certain someone, and now I can’t disable the block since the update? Can anyone help with this or is it permanent?
As far as I know, there is no on-site way to turn the feature off. However, I built a workaround a while back.
My “Waypoint Tweaks” userscript has a feature that will automatically un-hide posts from users you have hidden, once the page has finished loading. If you don’t know what a userscript is, I did a short write-up in this thread.
Hope this helps. 
We will look in to this situation. Thank you for the information.