User blog comment:DaNASCAT/Technical Update: March 7, 2016/@comment-1370845-20160309201743/@comment-4784321-20160309202736

What exactly is showing? If it's the CAPTCHA where you have to check a box to make sure you're not a bot, that bug is known and is being fixed right now. If it's a spam filter, what error does it give? Do you have a block ID?