Missing Safari settings option "Safari opens with" I am running OSX Mountain Lion 10.8.3 and Safari 6.0.4

In Safari, the setting General -> "Safari opens with" is missing. 

I remember using this setting to turn off session restore a few weeks back. But now its gone.

Type "Safari opens with" in google and "missing" is autosuggested. So I am not the only one with this problem. However, I didn't find any good pages/posts talking about this issue.

Can any one offer ideas on how fix this?

Edit:

To clarify, its not that some of the options in the setting are missing, but that I don't have the setting for "Safari opens with" at all.
I have the setting Default search engine and below that directly New windows open with, without Safari opens with in between.
That option has been removed from recent versions of Safari.

I'm not aware of which exact build removed it, but I can confirm it is gone and should be gone on all clean installs of Safari on top of OS X 10.8.3 and later. After running all available updates as of May 1 - you should have Safari version 6.0.4 (8536.29.13) and no Safari opens with preference.

Unless you have a defaults write… terminal command to re-enable that setting as a hidden-features, spending time troubleshooting this would be inadvisable since the control you are looking for is gone for now.