One thing I loved about New Vegas was that I did not experience a single CTD, which I could not say about Fallout3. The latter would crash often at no particular event or action. Very disturbing that after the recent update and then install of the DLC, I began to experience CTD in New Vegas - often, just like ol'Fallout3. I am not sure what else to post here that might help identify the problem. I did not change my system, or apply any other software or updates - just those two things I noted earlier.