I’m also seeing this with my upgrade from 2.8.1 to 2.8.2
Can login as an admin, see the initial dashboard and then it disappears and is just a blank white screen that looks to still be loading.
Strangely I can get to specific pages, like my site stats, but going to the dashboard brings up the blank screen.
I tried disabling all plugins, no joy. Is there a log file that WordPress creates that I can study?
Thanks.