In the interest of making people’s experiences less surprising/frustrating: I am aware of a bug that seems to happen on some posts, where you can’t vote on comments that are deeply nested. (It happens on the latest Zvi post for me, for example). I am working on fixing it. In the meantime, you can still vote on them, but your votes will only display when you refresh (which of course isn’t an acceptable state of affairs, but might make things slightly less frustrating).
In the interest of making people’s experiences less surprising/frustrating: I am aware of a bug that seems to happen on some posts, where you can’t vote on comments that are deeply nested. (It happens on the latest Zvi post for me, for example). I am working on fixing it. In the meantime, you can still vote on them, but your votes will only display when you refresh (which of course isn’t an acceptable state of affairs, but might make things slightly less frustrating).
This should now be fixed. Sorry for the inconvenience!