The partial-frame flashes was discussed in another thread.
http://www.reduser.net/forum/showthread.php?t=4678

Basically that's a "rolling shutter" effect and it's the way the camera works. Either you sync your flash precisely to the camera (apparently there's some period of time when all pixels are being exposed, at least with the 180 shutter at 24 fps) or you use a flash that lasts at least 1/24 sec (good luck with that) or you accept partial-frame flashes. Or you don't use strobe lights in your production.