Bug prevents me from suggesting a URL

I cannot submit my site as the anti-spam part of the form does not recognise the input. please can you fix this?

thanks

There is a workaround, explained in this post.

Staff are aware of the bug, which has been around since the text box thingy was implemented, and we've been told that they are working on it. The programmers have a lot of things to do, and I have no idea how high this is on their list of priorities.