Green in viewer and very slow

My first couple of days with FCP X. I have 2 x major problems - that maybe related.
The first problem is that it feels like it is slowed down by background rendering but when i check the background tasks everything is idle.
Second as I scroll or play from either event browser or timeline a blank green image appears in the viewer - suspect that this maybe causd by the slowness. it has now got to a point where I cannot continue as almost at a complete halt. I hav equit and restated FCP and also restarted the computer - I have replaced finalcut.plist from the user library.
I am using an iMac 27" - Jauary 2010 - 16 Gb ram. Hard disk external WD firewire 800.
Does anyone have any ideas?

Many many thanks - It was not until I read your reply that I remembered that the footage I was using was from a corrupt Card, that was not recognised by FCP 7 (or iMovie for that matter) and it had been extracted (some months ago) by a converter to H264.
I converted it via Streamclip, this morning, before importing it again into FCP X and all is well.
All the same I had asked FCP X to optimize it on original import. BUT it may not have completed that, as FCP X told me there were background operations in progress when It quit it to do a reboot. Now that might mean that FCP X does not continue to optimize when it restarts - must check that out.
You have saved my bacon. Thanks

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