Yesterday I installed 6.72 build 4776 and as far as I can tell everything went well.
The only issue so far is clicking the little lightning bolt icon in the UL of the main screen for the group I'm working with has no effect.
To download new headers I have to go back to the Groups List screen, right click on the icon and select download new headers.
My system is an HP ENVY 750-167c, Intel i5-6400, 12GB, 1TB HD running WIN10.