As was pointed out in this forum thread there seems to be an issue when upgrading to 4.7.2 from a previous version. I do not know what the problem really is nor which versions are actually affected. What I do know is that I was able to reproduce the issue on my local machine while upgrading from 4.6.2 to 4.7.2
I would strongly suggest to not attempt an upgrade to a recent version (including post 5.0.0) until I have more details and understanding of the issue.
I do apologize for the inconvenience and I will keep you posted.