Hi Glenys (and everyone else!),
regarding which browser to use to view HotPots on Macs, I have found that Safari now works better than Firefox
When viewing a JMatch with Firefox on Mac, if there are any media players in items on the right-hand side, then they become impossible to "drop", once you begin to "drag" them. I have only found this behavior in Firefox on Mac. Firefox on Windows works fine and Safari on Macs works fine. My hunch is that Firefox and Flash are not communicating as they should on the Mac. Bit of a puzzle that.
Anyway, I have now added the HP 6.2 "source" templates to Moodle 1.6, 1.7, 1.8 and HEAD (which will become Moodle 1.9). I also added the Safari fixes. The modified scripts will be available from the Moodle downloads page in due course (usually within 24 hours).