Every page I go to in the Cloud http://forums.adobe.com/community/creative_cloud forum shows the message in the title when the page loads
And, when I post a reply, I get "An error occurred while trying to submit your post. Please try again." BUT message is actually posted
I cannot reproduce the message about secure content. Are you using HTTP or HTTPS in the URL you use to reach forums?
Did that... had to do a full login again, but seems to have fixed the problem... aren't (failed) upgrades just wonderful?