I have the same problem with two different sites with two different conditions (both are using WordPress 5.0 Beta 2, and are all new sites);
1. Site #1 no plugins activated but when I clicked edit, it shows me a blank page. I found out that it is related to the memory or my host configuration (it is hosted in a cheap shared hosting)
2. Site #2 is new, with Yoast SEO plugin installed, hosted in a more expensive shared hosting. When I clicked edit, it does not show me the blank page, but if I activated the Yoast SEO plugin it showed me a blank page.
So from here, I think either it is your host configuration or your other plugins. I notice Yoast is not the only plugin that causes the site showing blank page once edit button is clicked.
I am going to post this on Yoast Support forum if anyone has not posted this yet.
Hope your problem is now fixed.
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This reply was modified 6 years ago by kim09.