close tab buttons disappeared

The same thing is happening to mine. The 'x' button on active tabs is disappearing and then not coming back. I have to press contol + click to get a drop down menu in order to close it out. How do I get my Xs back?

On a side note, for some reason command Q won't quit Safari, and when I go to the File menu, Quit Safari is grayed out (not able to click it).

How do I fix these problems?

The tab must be active in order to see the "x".

Command + W closes the active tab.

This may come in handy for you > Safari 5.1 (OS X Lion): Safari shortcuts

Ok, but the x disappears after a few seconds of reloading that page.

Try hovering your mouse cursor where the x should be.