THis happens way too often for it to be a user error. Ill be moving an anchor point and there its good and i go to rotate and what happened...the anchor point is now somewhere way off screen. this keeps happenneing lately
I just completed a post for the very same issue. I think it has to do with the anchor point being outside some camera clipping limit. In mine I can always see them in the camera views but I can't see the widget in the ortho views if the anchor point is shoved too far into depth (either way).
The responses have not been helpful so far.