You shouldn't have to do anything special. Just trying to figure out where something got corrupted in the switch from 4.8 to 5.0 and currently have nothing to work with.
Have you added any new programs or changed any services, or did you go through the steps outlined with nothing intervening? Maybe a corrupted 5.0 installation-remove through add/remove, boot, boot into safe mode, run uninstaller, boot, reinstall.