We are sorry to hear you are having problems registering. If the registration page refreshes with the password blank, please check the whole form for writing in red eg 'username already taken' or 'you can't tick yes and no'. Please correct the errors and then re-enter the password. The problem is rarely the password but the password always disappears when there is an error elsewhere on the form.
I hope that you will have no further problems. If you still have difficulties, please get in touch with us.
Finally take a look at the document on the page here - Top tips with registration.