QA 404 error

I seem to have an issue with customizing Q&A. I try to use jquery validation plugin with it but for some reason I have weird problems. First of all /questions/ask/ shows as 404 error page so that's where the problem might be because when I try to submit a question it just shows the page stripped out of everything but the footer. Any idea? thanks
I don't have to use any specific validation engine it's just that I use this one for the rest of the site, it just seems to be a problem with this plugin but first he 404 error is weird and that might be the cause.
I totally had to customize the templates since the basic one breaks all my templates,
I attached what happens when I try to submit the form. The form disappear and then page is blank.