We're aware of the issue with Mac users progress being lost due to the latest update.
We're very sorry that this has happened and are working hard to rectify this issue. When we tested this version before release, we did not have any issues so were not aware of the problem until we received some feedback from you.
We're working on a fix for this, and rest assured that your progress is not lost, simply misplaced. When we release a fix, all of your previous progress should be returned to you.
We're sorry for this inconvenience, and we hope that you will bear with us whilst we fix the issue.