GF unable to submit website field or any html

I don't know if I'm missing something really obvious here but I cannot get any form to allow the submission of html code in the body field or the website field.

I have created a test form with just title, website and body and this doesn't submit either. It just redirects back to the form with no error given. However, on removal of the http:// from the field and submitting with this field as empty - it submits!

I have cleared all plugins and tried it on the basic theme to no avail. I have an adaptation in my functions.php file that allows me to include mapping in my forms, but even deleting that had no effect...

This was on my live site and this has been duplicated on my test site - so I'm not sure if there's something in the server settings that could be causing this. Some sort of file permission or something that prevents html from being posted? Though I doubt that it's a setting in wordpress itself as I'm posting as admin.

The only error I can find with console is:
Resource interpreted as Other but transferred with MIME type undefined.

The simple form is here: http://www.madfall.com/test-post-submission
while the new form I'm looking at is here: http://www.madfall.com/uploads

About the only thing I haven't done is created a NEW site and see if i can recreate the error that way - but hoped someone might be able to enlighten me before i had to go to those lengths (and while I've read somewhere that I'm ok to use my licence on my development/test site, I don't want to start another site unless that's against my licence?).

Thanks.

Thanks Chris - I've removed the comment field and still nothing... Tried what I could see on the link you posted (reasving the permalinks) and again - nothing.

I think I'll have to try and replicate this on another domain on the same hosting for testing - just to see if I can recreate this problem a third time - but this time with no plugins at all and just the usual theme - you never know what some of the plugins might have changed along the way.

BTW - this has been happening since I bought it a few months ago, so can also rule out the recent upgrade to WP3.3.

Will update the thread once I've done the above....

I'm currently hosting with 4u Hosting in the UK - I'll try and reproduce it on a totally clean site with them and if it causes the same problem I'll go after them to see if they've got a setting that's stripping the html out.

My operational site is on http://www.mudandroutes.com - there's a few forms on there that work perfectly except I cannot submit html. I found that out as I created a load of html (links and formatting in excel) that I wanted to submit via the forms and it just blocked the submission with no error and returned to the form (but a blank form).