The Preview function can be pretty temperamental - you can try another browser (Chrome and Firefox seem to work best). and on large sites it'll take a long time to load initially but some days it does just seem to endlessly load. Reported as an issue to Tactuum.
If you do manage to get the Preview to load and you're going to be using it frequently during a session, a tip is to keep the Preview page open and then just refresh as needed to save having to reload it each time.
Please sign in to leave a comment.