AGN is currently experiencing some bizarre database errors which may be impeding your ability to post or read certain threads. The staff is looking into this matter but as of yet we have been unable to determine the cause.
Posts are still being recorded despite the display "Database error", so try to refresh the page after a post to confirm it went through. Certain threads are also experiencing issues with their page links: you can switch the display to Threaded Mode to read new posts in these threads. It's inconvenient but at least the posts are still there.
Thank you for your patience while we figure out what's wrong and try to get it fixed.
EDIT: The database errors have been fixed. As for the threads that are experiencing issues with their page links, changing the way the thread is displayed is still a temporary fix. You can also increase the number of posts displayed on a single page in your user settings, which will circumvent the issue.