I installed the FormBuilder 0.7 and FormBrowser 0.4 modules, from the module manager itself and all went fine. CMSMailer also works and I confirmed it with the test email.
I am now trying to use the form builder to create a contact form, and I used the simple one that comes with the default FormBuilder install.
I am trying to get this to work but when I submit the form it just redirects back to the form, with the fields empty. No error message is displayed, even though 'Hide Errors' is switched off. I also tried to submit the form with empty data and no error is displayed even though the fields are compulsory.
I did not touch anything in .htaccess or anything of that sort, it is the default stuff CMSMS installed.
What could be wrong?

Thanks.