Hi Ray, Sorry but it is still not working.
What happens when you go to the Gallery page is it displays an alert (attached). Then clicking OK opens the gallery, but not to the design selected (screenshot attached) but to the first option available which in this case is 'FLOW'. I still can't change the design on the Choose Design Tab, the apply prompt is displayed but nothing happens when I click on it. I understand that the alert is indicating a coding error but I don't want to go digging as I have no idea what changes you have been making.