Thanks Pilou - Handy script!

Tried it out and the loop script seems to only work if the associated (looped) curve sections reside on a shared plane.

Perhaps the loops that are not being selected for me with this script have some sort of planar discontinuity to them.

Future software development ;-) could perhaps implement an angular tolerance so that loops around irregular solids could be selected. (good idea?)

None the less, this will be very useful.