Currently there's an intermittent problem with the site where creating content fails to load the rich text editor. It takes 24+ seconds to load as it's hung up / delayed or waiting.
For example:
Is missing this:
This has been reported to the site admin team, and may be a problem that happens sometimes, but not always.
It may affect more content than in the screenshot.
Previously reported similar issue:
/members-area/support/f/forum/51183/problem-with-creating-blogs-with-edge