It is true that you will get jittery or strobic motion when making fast pans or tilts in the XL-1's frame movie mode.(posted 9128 days ago)This has nothing specifically to do with the XL-1, but is simply the result of progressive scan -- of an image only being updated every 30th of a second.
The solution? Don't pan or tilt quickly.
This is generally the rule with film, which has the same problem with overly-rapid camera moves.
BW