It happened to me too. There is a option (new?) in the map, called "User something", with 3 buttons. Try with all of them, as one of them, the one that lets you measure distances at least, does not allow for map zoom, or at least that was my experience.
In relation with the topic, I also have to agree. I don´t like the new map at all.
Have you ever tried the scroll weel of your mouse, works fine for me