I made a topic a bit earlier on how to fix this.
It is here: http://www.gamesas.com/index.php?/topic/1130673-victorelevator-fix/
However if you want the short version, go into the Lucky 38, try clicking on Victor a few times(you may have to try clicking on the elevator and then Victor, that's how I did it), then open up your companion wheel with any companion. Select the talk to option, then scroll down to the bottom of the dialog and choose goodbye. As soon as the dialog closes you should hear Victor ask you where to, and the elevator dialog box should pop up. Choose where you want to go, and after that it should be fixed and Victor will behave normally. When I did it I used Rex, but I have been told by others that it works with any companion. I hope it's a permanent fix but I don't know. All I can tell you is I've logged in about 15 hours since this glitch hit me and have not had a problem with it since. Best of luck!