White screen that shows me nothing (solved by flushing rewrite rules)

[danieltj27]

Describe the bug
When activating the Gutenberg plugin from the 4.9.8 callout, it takes you to a page that I assume should be the demo page judging by the URL (/wp-admin/post-new.php?gutenberg-demo) but it's just a blank white screen.

To Reproduce
Steps to reproduce the behavior:

1. Install WordPress 4.9.8 and login
2. Click to install Gutenberg from the callout added in 4.9.8
3. Click to activate the plugin
4. Redirected to a white screen

Expected behavior
I expect to see the post edit screen with the Gutenberg editor, not a blank screen.

Screenshots
Just a white screen.

Desktop (please complete the following information):

• macOS High Sierra, Chrome 68
• Gutenberg 3.5.0

Additional context
N/A

[danieltj27]

Oops, this issue here is that as it was a new setup, the rewrite links were not flushed so the API route wasn't defined (there was a 404 in the console trying to find wp-json/wp/v2). Fixed... kind of.

[pento]

Hey, @danieltj27.

By "kind of", do you mean it's working now, or there's something else not loading correctly?

[danieltj27]

Fixed kind of in a sense of whilst it's now working fully, as Gutenberg relies on the rest API, I'd expect some kind of message alerting me that the API is unreachable (or just have Gutenberg flush permalinks on activation to try and avoid this issue altogether).

[gilesfraser123]

I have the same problem, I installed Gutenberg and now get a white editing area when I try to edit a page. I have no idea how to sort it out.

[FilRav]

White page after upgrading from version 3.4.0 to 3.5.0.
(Wordpress version 4.9.8-it with default theme Twenty Seventeen. I had also the plugin "Insert Pages" ver 3.4.2, but after reinstalling old version of Gutenberg everything work again)

[danieltj27]

Go to Settings > Permalinks and click the save changes button which flushes the rewrite rules. That should solve the problem (unless it's a deeper issue).

Gutenberg (whilst it's a plugin at least) should do this for you on activation considering it completely relies on the REST API.

[FilRav]

Thank you for your quick answer. I've tried but unfortunately it doesn't solve the issue. I revert to 3.4.0 version :P

[gilesfraser123]

Doesnt solve the issue for me either. still get a white editing area.

[FilRav]

[SOLVED]
I've changed the browser from Google Chrome 49.0.2623.112 to Firefox 52.9.0 and I can edit the page as usual. There's no need to go to Settings > Permalinks to flushe changes. Thank you

[gilesfraser123]

Still doesnt do it for me. I shall leave it alone until there is an update.

[FilRav]

I noted that if a page has gallery with "Link to none" it can result to a white page (it has also a shortcode for "insert page" in my case). As soon I switched to "Link to media" in gallery options, the page becomes editable again (I have to switch browser from Firefox to Google Chrome and viceversa)

[designsimply]

As Gutenberg relies on the rest API, I'd expect some kind of message alerting me that the API is unreachable.

Noting that this is being tracked in #8549.

[designsimply]

I have been testing with 3.5.0 and have been unable to reproduce this problem in testing so far.

@gilesfraser123

Does the blank white editing area problem happen for you for all posts and pages on your site?

As a very basic troubleshooting step (and since @FilRav mentioned changing browsers helped their case), can you try clearing browser cache and cookies to see if that makes any difference for you?

If that doesn't help, are you able to check your browser console to see if any errors show up there at the time you see the problem happen?

[danieltj27]

Thanks @designsimply I didn't see that issue. I'll follow that one.