I just wanted to post something that I read on this forum that fixed the bug that gives me the black screen and freezes my game trying to get back onto the Strip. I did not come up with this, but just making a new topic so everyone can see it and hopefully try it out, since not everyone is willing to read through all the threads that might have this information. So enjoy!
If you are having problems getting back onto the New Vegas Strip, head to the Crimson Caravan Camp, and buy the old cowboy hat from Blake, the vendor outside the main office. I equipped the hat and tried reloading the Strip area, and it worked! I am not sure if you need the hat equipped or just in your inventory, either way this is a good solution!