It sounds like the install is missing a default file. Try verifying the integrity of game files on Steam:
- From the Library section, right-click on the game and select Properties from the menu.
- Select the Local files tab and click the Verify integrity of game files... button.
- Steam will verify the game's files - this process may take several minutes.
As far as I know, this is the only way to try to fix missing default files, and I have no idea how it's possible to not get them with the initial update.