Here's some 101 Tips to keeping things smooth.
#1: The patch can't fix freezing issues on old saves
period the files are to clogged with corrupted data from before the patch. Restoring the file system from "Safe Mode"[google it] will clear away any corrupted data and help smooth things out for a while.
#2 Turn off autosave on travel, a common place for a freeze is when entering a new area, it will happen less often if autosave on travel is off and you don't risk corrupting your autosave by having ro restart.
#3 Do not overwrite save data, your game will run much smoother and for much longer if you simply save to a new file each time and delete the old ones later.
#4 A lot of random *)*$@* can happen in this game, that causes a hiccup a one in hundred hiccup that stops something form happening that was supposed to happen. If you follow step #3 its a simple matter to reload an earlier save. Just because it happened to you doesn't mean it happened to anyone else.[BTY anyone have the terminal outside the solar array at Nellis disappear?]
There is a certain amount of leeway that must given to a game of this size, but come on!! Okay, the game freezes, I get a little frustrated and restart it. How in the world are they going to let a bug slip by them that makes continuing the main quest impossible. I refuse to restart the game. I CANNOT GET INTO THE NELLIS AIR FORCE BASE!!!!!! No matter what I do the guard just stand there with his back to me. What a joke!! I WAS a huge Bethesda fan, however I am almost fed up. We should not have to being posting bugs/glitches on forums for Bethesda to work out now. They pay people to do that, now we're paying them to be game testers?! I hope they put out a patch that really ties up ALL lose ends.
I was just at Nellis and got in just fine and the board isn't full of people screaming about it so this probably isn't a common bug, it very well could be some random hiccup that only your suffering from. Did you try reloading from an earlier save? you didn't by chance enter through the train tunnel and are attempting to enter the gate at the east side of the base,