Hi,
krpano or Flash doesn't make any caching here,
the caching was handled by the browser,
e.g. when requesting for an file:
krpano => Flash => Browser => Server
you can use the normal HTTP methods to avoid caching,
maybe set it via PHP in the http header or add a random id to
the file request (e.g. pano.xml?id=4535435)
best regards,
Klaus