Hey @MartinRayVaughan,
Thanks for the updates. Just for future topics, self-responding or bumping your post pushes it back in our Queue system so it takes longer to respond to. We provide support to our customers 24/7/365 in the Support Forum. Support questions are answered in the order received and responses may take up to 24 hours (typically sooner). Complex questions or busy times may take longer.
We have logged in to your site and we can replicate the issue. We tested the issue on all our local testing servers and we do not encounter such issues. This issue seems specific to your site only. Can you please re-install the Pro theme? You will have to do a manual theme install. You may need to check this documentation guide to know how:
Kindly let us know how it goes.