Corrupted clip freezing FCP X during background rendering.

When I open a particular project, the background rendering starts up and gets to 35% where it then freezes the whole job.
Had to do a Force Quit.
This first occured during colour/exposure modifying, btw.
On start up of FCP I can review the video in the project window and see that a small part of one clip is corrupted, but as soon
as I open FCP (10.0.7) it attempts the backgound render before I can stop it, there-upon freezing.
Can the particular offending clip be successfully removed before I open FCP?
15" MBP with retina display, OSX 10.8.2
Thanks in advance.
Andrew

BenB
Thanks for that - "selected", but not "opened" I see.
Also, I reckon they should change the confusing menu item "Project Properties" to straight "Projects" Yes-No?
RussH
The particular clip would jump around - black frames-out of position frames -staccato playback.
As I said, this was after I'd tried colour adjustments that wouldn't render beyond a certain point.
Thanks for that lead to Pro Maintenace Tools. Does it work specifically with FCP X?  Will check it out.
I do have the very handy Event Manager X.
Thanks all

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