..repair redirecting after posting?

[LiAmmx]

Im getting this message:

This post is a duplicate of a post that you have posted in the last five minutes. You will be redirected to that thread.

Click here if your browser does not automatically redirect you.

Any time I post.Instead of showing the message added in the page, as it was being done till today.I installed Enhanced Image Captcha without succs, uninstalled it and the problem shows up.

Any ideas of what might be wrong? I cheked and Ajax features are enabled.