batti87@libero.it wrote: Hi,
in my web site registration suddenly doens't work and when i choose registration plan the fields don't change www.autodreams.it/component/comprofiler/registers.html

Regards
Francesco

Please check your page with firefox.

I see 2 errors:

Timestamp: 8/5/12 3:18:12 π.μ.
Error: The stylesheet www.autodreams.it/templates/new_autodreams.it/js/facebook.js was not loaded because its MIME type, "application/javascript", is not "text/css".
Source File: www.autodreams.it/component/comprofiler/registers.html
Line: 0

Timestamp: 8/5/12 3:18:12 π.μ.
Error: missing ) after argument list
Source File: www.autodreams.it/component/comprofiler/registers.html
Line: 14
Source Code:
jQuery.validator.addMethod("remotejhtml", function(value, element, param) {

batti87@libero.it wrote: Hi,
in my web site registration suddenly doens't work and when i choose registration plan the fields don't change www.autodreams.it/component/comprofiler/registers.html

Regards
Francesco

What fields should change?
Have you configured the CBSubs plans to hide some registration field?

Please note that if you have javascript errors on a page it may break other functionality that also needs javascript.

So, you need to fix all javascript related errors on that page.