Since at least Minecraft 1.11.1, every once in a while, Villagers will not seem to have trading menus (won't talk with you). I've tried quitting and restarting the game, and leaving the village and going several chunks away, then quitting and restarting, Neither helped. The first time it happened, I ended up just killing off the Villager. When other Villagers were born, they were fine. That was about a month ago. Since then, when I've found one or two, I've just ignored them. They still perform their tasks, if they are farmers, at least. Otherwise, they just roam around.

My daughter was playing tonight, and in her village which has been growing quite successfully, she now has three Villagers who just look at you helplessly and can't trade. She doesn't want to kill them...for one thing because she has just gotten her first iron golem, and she doesn't want to anger it!

At any rate, because of that, I know that it's not just my computer and my game. It's happened on two computers now, that I know of for sure. We are both running the latest version of the game, and the latest launcher, and both of us have Windows 7 computers. My computer is more power than hers, with more RAM.