Many of you may have experienced this issue after updating your WordPress version (specially after WordPress 5.6). The conflict caused by WordPress 5.6 updated Gutenberg editor with your excising theme’s visual editor. Keep in mind that this is not the issue called White Screen of Death (WSoD).
There are 2 suggestion to overcome this issue by the WordPress Community.
- Disable the Guttenberg editor by installing Disable Guttenberg plugin
- Or Install WordPress Classic Editor plugin