Dfewer

I've been trying to reply to a thread I started in Photography section. I write some text, then click the "Insert Image" button, put in the image URL, and then click "Submit Reply."

It directly goes back to the thread as if I had not replied to anything. I retried it twice quickly and it gave me a warning saying "This post is a duplicate of a post that you have posted in the last five minutes."

I've tried redoing it several times using "Quote," "Quick Reply", and "Post Reply" with similar results. Even previewing the post has no effect on being able to post it. One image is from ImageShack and another is from somewhere else.

I've retried it using both updated Firefox and Opera.

Am I blocked from linking images? Could it be aliens? Help!