Started the game and everything worked fine. Except for the usual crash or freeze. Which I have played the 360 version so I know that there would be a certain level of glitching. Since I started the Old World Blues expansion it is crashing almost every other time I fast travel. It just pops up with FalloutNV has stopped responding. Before when it would crash the spinning wheel in the wait screen would just stop and never start again now the whole program seems to be crashing. Here is what I'm running

Windows 7 - 64bit

Fallout NV Ultimate

8GB Ram

AMD Firepro Video card

AMD 6 Core 3.0 ghz

no game mods

Are there any fixes for this issue? Does it seem to persist through this expansion only or does it keep getting worse?

Are you using auto saves. It is best to disable auto saves especially on travel. Quite often that is where the game hangs since it is saving character game save as well as loading new content.

Toss up a dxdiag.