I am having the exact same problem as sweetvincent.
Following the upgrade I was asked to update my database when I try to my Disqus ID and password are not accepted as a matter nothing happens at all it just refreshed the page.
I have an identical development site that I cloned from the main site Disqus was not updated on the development site and still works fine. I’ve noticed that the Disqus setting seem to be different on the page that works and on the development site that doesn’t.
The differences are on the non working site the short name is missing and it looks like some other info in the de-bug information area posted below is missing as well.
URL: https://www.twocentreport.com
PHP Version: 5.4.26
Version: 3.9.1
Active Theme:
Tempera 1.0.1.1
URLOpen Method: curl
Plugin Version: 2.76
Settings:
dsq_is_installed: _disqus_sync_lock:
_disqus_sync_post_ids:
disqus_active: 1
disqus_forum_url:
disqus_api_key:
disqus_user_api_key:
disqus_replace:
disqus_cc_fix:
disqus_partner_key:
disqus_public_key:
disqus_secret_key:
disqus_sso_button:
disqus_sso_icon:
disqus_manual_sync:
disqus_disable_ssr:
disqus_last_comment_id:
disqus_version: 2.76
Plugins:
Akismet 3.0.0
Disqus Comment System 2.76 (active)
Go Daddy Quick Setup 1.04
Hello Dolly 1.6
Limit Login Attempts 1.7.1
Repost 4.09
Super Post 2.0.5
Super RSS Reader 2.5
Visual Form Builder 2.8.1
WP Exclude From Homepage 1.1.3
YouTube Channel 2.2.0