I upgraded a website that I am developing to WP 5.3. Everything had been working fine before this. Following the update, when I go to edit or add a page or post I get a blank white screen, enabled debug in WP config and there were no errors shown. Also no errors in server logs. I tried these steps:
1. disable all plugins
2. switch theme to Twentytwenty
3. try different browsers (Chrome, Firefox, Edge) & clear browser cache
4. Reinstall WP 5.3
Still I was getting blank white screen on edit post/page. Then I installed Classic editor and when I edited a post it worked! I disabled Classic editor and it was back to blank screen on edit. I then installed the Gutenberg plugin (7.0.0) and it worked! If I disable Gutenberg plugin it’s back to blank screen. But I shouldn’t have to install Gutenberg plugin for it work. Any ideas what the problem is here?
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