Video Playback Is Stuttering

Problem:
FCE running on G4 Powerbook with two external Lacie 120GB drives. Woke Mac up from sleep to continue editing and now the video is playing back all stuttery (it even freezes completely on tv monitor). Audio continues to play normally.
Project is long, over an hour.
Have repaired permissions, ejected and reconnected drives, to no avail.
Opened a different project and it did the same.
Any thoughts?

Threatening my Level 2 status I must ask:
How do I trash the preferences?
Afraid to throw out something important.

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