Second time i see that in a new clean installation of 4b3. Several base pages are auto-created.
See:

Description field is gone?
http://prntscr.com/dxjsvy
Where are those features in 4.0?
When a user creates a question, he is not auto subscribed to the topic.
When I edit a post, the system shows me “… edit 1 minute ago”. But it also updates the created time, so it also shows “Posted 1 minute ago”, when it was really posted hours ago.
[18-Jan-2017 17:20:46 UTC] PHP Fatal error: Uncaught Error: Class ‘PC’ not found in /home/wp-content/plugins/anspress/includes/ask-form.php:237
Stack trace:
#0 /home/wp-content/plugins/anspress/includes/process-form.php(197): ap_save_question(Array, true)
#1 /home/wp-content/plugins/anspress/includes/process-form.php(93): AnsPress_Process_Form->process_ask_form()
#2 /home/wp-content/plugins/anspress/includes/process-form.php(66): AnsPress_Process_Form->process_form()
#3 /home/wp-includes/class-wp-hook.php(298): AnsPress_Process_Form->ap_ajax(”)
#4 /home/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters(”, Array)
#5 /home/wp-includes/plugin.php(453): WP_Hook->do_action(Array)
#6 /home/wp-admin/admin-ajax.php(91): do_action(‘wp_ajax_ap_ajax’)
#7 {main}
thrown in /home/wp-content/plugins/anspress/includes/ask-form.php on line 237
This just happened in one of our questions …

Hello Everyone,
Please download and try our latest beta release from here:
https://github.com/anspress/anspress/archive/4.0.0-beta.3.zip
Changelog can be seen here:
- Normalize addons path
- Added subscribe button
- Check if user can access post before sending email
- Fixed: PHP Fatal error: Uncaught Error: Call to undefined function ap_delete_subscriptions
- Fixed: Question border not being highlighted
- Removing codeception tests as PHPUnit test will be written from scratch
- Improved email notification and subscribers
- Added email queues and content table
- Added subscription CRUD
- Fix Categories can’t remove icon or add a new one
- When using BuddyPress Add in the links to answers and reps don’t work.
- Fixed MySql datatype of qameta views and flags to store large numbers
- Fixed: illegal string offset date
- Fixed attachment delete
- Fixed delete uploads
- Renamed author page to user page
- Update term ids
- Improved list layout
- Include missing template files
- Rename base.php and content-list.php to question-list.php and question-list-item.php
- Fixed: non-logged in user seeing moderate answer
- Removed dynamic avatar addon
- Migrate category meta
- Fixed static method warning
- Fixed best answer migrate bug
- Do not show upgrade message to new installs
Please give our project a star on GitHub. Thanks