No, it's not just you.  There's a technical name for this effect,
something like "strobing."  Perhaps a filmmaker on the list can help?
I saw a brief discussion of it in some magazine (forgotten which)
earlier this year & if i remember right it's a result of panning too
fast for certain lighting conditions, usually artificial or lower
light.
 
Lang Thompson
http://members.aol.com/wlt4/index.htm
 
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