Not sure if this is a bug or not, but sometimes it works to mouse-over the sector dots on the map to see the name, but most of the time I have to actually click on each sector dot to see the name. This is most annoying when I'm trying to find a sector quickly. You should be able to hover the mouse over the dot to see the name of the sector without having to click on it.
Actualy I noticed that also. Some systems I can however over with mouse and name pops up and some not. Might be just because you have not discovered them or so.
You can use the doubleclick in list of System in map menu for autonavigation, but I guess you know that. You are probably more concerned about weirdness of map due to lack of information which I agree with. It needs some work.