Why don't these orange rendering lines go away?

s1365.photobucket.com/user/Marcusb007/me...zpsd03419be.png.html

All the other times the orange lines go away, these just stay here all the time? I pulled up the rendering screen box and it's just frozen at 5%?

I have a brand new '13 Imac and FCPX is really all I have running on it. When I play back my project, it seems like it's sketchy and sometimes skips a little... Is that because of the orange rendering lines, that wont go away? If I down load it to Youtube will it skip like it does on the play back on the Mac?

* Hope you can see the screen shot? I joined photobucket cuz everytime I try to upload a image it never works...

Well, that was pretty interesting....

I just closed FCPX and the pulled it up from my finder, and after it loaded on the desktop the orange rendering lines went a way.

Should I do this every once in a while? When ever I'm done working on my project, I usually just leave my Imac on and walk away till it goes to sleep. Then the next day or two, i'll sit down and work on my project again. Maybe I should close it each time I'm done working on my project?

The clip of the car needs to be rendered. It probably isn't in a format that conforms to the project. The reason the rendering goes away is probably because you have background rendering turned on.