Even if it turns out to be a temporary hiccup, I’m going to make a habit of redundantly upvoting and liking posts, just in case the post voting plugin croaks and we don’t have a good solution for it.
Unfortunately, comments have also gone away. Folks like me who made an effort to abide by the Q&A format now find themselves completely shut out of the conversation. Hopefully this is just a drill. I would expect fair warning before any permanent change of this sort, in order to repost the comments as actual posts.