Nothing has changed. However, I think you're confusing Zenith/Nadir points with Lagrange points.
The Zenith and Nadir points (extreme north and south of the system, basically) are the points where it is safest for jumpships to pop in and out. That's because it's far enough away from the star and its bodies where gravity doesn't interfere with the workings of the jump drive.
This is really, really, really far away from the star and its planets. Fortunately Campaign Operations provides an average travel time from the zenith/nadir point to each stellar type's "life zone." For example, the Sol system's life zone is 1.3 billion
kilometers away from the zenith and nadir points. Basically we're talking Mars, Earth, and Venus. It takes 8.53 days at 1g of acceleration for a dropship to travel that distance. Functionally speaking, travel times to planets outside the life zone would be only minimally shorter (Mercury) or longer (the Gas Giants). Here's a pic from the rulebooks that does a really good job of visualizing the distances involved:
http://s588.photobucket.com/user/Cannon ... p.jpg.html
Lagrange points, on the other hand, are simply points in the relative close orbit of a planet/moon configuration where an object can more or less maintain its position relative to the other two bodies. Lagrange points do not indicate the absence of gravity, in fact, quite the contrary. However, the interacting forces allow an object to maintain a stable position there. Typically the Lagrange points are within a few hundred thousand kilometers of the planet at most.
https://www.google.com/imgres?imgurl=ht ... mrc&uact=8
I hope that helps.
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Battletech campaign homepage (currently defunct): http://www.heavymetalpro.com/forums/vie ... hp?t=17910