Weird...  did you keep your preview window the same size as when you had your non widescreen monitor?  And are you certain you have a widescreen resolution in your OS display properties??  If not it could make things appear distorted like this...  something like 1280X720 or something like that rather than the 1024X768 or 1600X1200...

My two cents are spent!

Gerard

The GR00VY GH0ULIE!

You are pure, you are snow
We are the useless sluts that they mould
Rock n roll is our epiphany
Culture, alienation, boredom and despair