You may need a Mac forum for a better chance of help with this.
Of course on a Windows PC you would simply use System Restore, but I don't think you have that option.
Thanks. In the end I backed up all my data and reinstalled the last 'good' backup and then reinstalled my data. This meant that at least I should be starting from a clean base - at least as far as Mobile Connect is concerned.
Yes sounds like it, I hope you find a way round it.