I have seen similar comments, but nothing exactly like what I am looking for.
Mechjeb used to work great! Yeah docking was iffy, and I could blow through Monopropellant if I was not careful, but ascents and landings were flawless. In fact, I had rockets land from orbit right on top of the launch pad! For a while, I had a veritable forest of landed rockets scattered around the launch pad.
But the last few months I can't even land anywhere near the launch site. Sometimes I crash into the mountains, other times I am far out to sea. Sometimes I come screaming in with plenty of fuel, and it does not even attempt to straighten up and land vertically.
So, any ideas? What am I doing wrong? Is it Mechjeb?