Loss of llSetKeyframedMotion animated content after restarts is mostly an issue, i.e. quite rapid, in the northern regions of a 4x4 and to a lesser extent the SE region although ultimately it happens there too. The SW region looks to be by far the safest (probably 100%). As far as I can tell, single regions are OK and with megaregions the loss only occurs if the animation is in effect. Where the objects go to (if anywhere) is unknown as they don't show up in area search.
Exporting single regions with animations seems to work with animations persisting during export and import. Generally animation persistence (i.e. without special restart code) doesn't seem to be 100% reliable although this might sometimes come down to the animation being slow to restart. YMMV
Of course, hopefully this will be a temporary glitch with what promises to be a Really Useful Feature.
