I have a few Cyclamens that have flowered beautifully this last winter. They have sat in the same compost for two years now and I need to know when to change the compost. Should I do it now as the plant is dying down or should I wait and do it later in the year and chance disturbing it, when the corm starts to come back again?
I would wait until it has completely died down before doing anything myself. Normally one would repot just as the new top growth begins to appear, the roots generally follow slightly behind the new leaves.
They're pretty tough. I only grow the hardy species outdoors, but I generally move those in the winter when they're near-dormant and I can see where they are. You could probably get away with it any time, but when the plant's dormant in summer is probably the best time.