this is a bug, it is a recurrent issue in this version.
i can fairly predictably crash Ctrlr after editing the
2nd colour in a pair. the first one is usually ok, and
it is with the 2nd that it locks up. i can maybe get away
with it by saving between colours. seems to be when i’ve
done a wide colour ‘swipe’ across the palette, rather than
numerical entry/paste. hope this helps.
(can live/work with it, atm)