On my local installation (wamp) had the same blank home page. A refresh fixed that but then did not have a complete home page and couldn’t get to the admin pages. Rolled back the installation and then shut off all non-essential modules. Reinstalled 3.0 and again got an incomplete home page. Forced my way to the admin pages by URL. Turned all the modules back on. Everything now works.
Haven’t tried an update of my working site because I am on the road. You always publish the updates when I am traveling!! Cannot for the life on me figure out how you know when!