"Sorry, you are not allowed to edit this item."

[ghost]

Prerequisites

• Can you reproduce the behavior you wish to address with all other plugins deactivated?
• Are you running the latest version of Pressbooks and the latest version of WordPress?
• Are you experiencing this issue with one of our built-in root or book themes?
• Did you perform a cursory search to see if your bug or enhancement is already listed?

Description

After upgrading from an earlier version of Pressbooks (v3.1.2 to v3.9.7), on some books, when a user makes edits to a page and clicks the "Update" button, the user is sent to a grey page that says "Sorry, you are not allowed to edit this item." When the user then refreshes the page, the editor page loads and the user's edits were saved. This seems to occur regardless of the user's "roles" (I've tested as a network super admin, and this behavior persists).

This issue seems to be resolved by going into the Admin > Book Info area and changing the Language of the book to "English" and Saving. On books that are effected, the Language field is blank.

Steps to Reproduce

1. Create a book using an earlier version of Pressbooks
2. Update Pressbooks
3. Navigate to Admin > Book Info and make sure the language for that book is set to blank
4. Navigate back to the edit area for that book, make edits, then save the edits

Expected behavior: The edit page should reload with a message to the user saying that the changes were saved successfully.

Actual behavior: A page with the words "Sorry, you are not allowed to edit this item" loads.

System Information

Book Info

Book ID: 29
Book URL: https://courses.lumenlearning.com/test/
Book Privacy: Public

Browser

Platform: Apple
Browser Name: Chrome
Browser Version: 58.0.3029.81
User Agent String: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36

WordPress Configuration

Network URL: http://courses.lumenlearning.com/
Network Type: Subdirectory
Version: 4.7.3
Language: en_US
WP_ENV: Not set
WP_DEBUG: Disabled
Memory Limit: 512M

Pressbooks Configuration

Version: 3.9.7
Book Theme: Bombadil
Book Theme Version: 0.1
Root Theme: Pressbooks Publisher
Root Theme Version: 3.0.1

Pressbooks Dependencies

Epubcheck: Installed
Kindlegen: Not Installed
xmllint: Installed
PrinceXML: Not Installed
Saxon-HE: Not Installed

Must-Use Plugins

Pantheon: 0.1

Network Active Plugins

Amazon Web Services: 0.3.5
Candela Analytics: 0.1
Candela Attributions: 0.2
Candela LTI: 0.1
Candela Outcomes: 0.1
Candela Thin Exports: 0.1
Candela Utility: 0.3
Display Kitchen Sink by Default in Visual Editor: 1.0
LTI: 0.1
Native PHP Sessions for WordPress: 0.5
Pressbooks: 3.9.7
Pressbooks mPDF: 1.6.1
Snapshot: 2.5.0.1
WPMU DEV Dashboard: 4.0.8
WP Offload S3: 1.1.1
WP Offload S3 - Enable Media Replace Addon: 1.0.1
WP Redis: 0.4.0

Book Active Plugins

Inactive Plugins

Candela Hypothesis:
Candela Links: 0.1
Disable Comments: 1.5
WP-Piwik: 1.0.8

Server Configuration

PHP Version: 7.0.17
MySQL Version: 5.5.5
Webserver Info: nginx/1.8.1

PHP Configuration

Safe Mode: Disabled
Memory Limit: 512M
Upload Max Size: 100M
Post Max Size: 100M
Upload Max Filesize: 100M
Time Limit: 120
Max Input Vars: 10000
URL-aware fopen: On (1)
Display Errors: N/A

PHP Extensions

cURL: Supported
cURL Version: 7.40.0
imagick: Installed
sass: Not Installed
xsl: Installed

Pressbooks: 3.9.7
WordPress: 4.7.3
PHP: 7.0.17