ditch it and use Chrome.
click on Tools > Internet Options > Advanced. make sure a tick is on 'Use Inline AutoComplete'
Then in Internet Options, click on Content > AutoComplete Settings. Put a tick against 'Forms' and 'User names and passwords on forms'
is it just this site ?
have you gone into :- tools / internet options / in general theres a tickbox for " browsing history - delete on exit " needs to be unticked ... not sure how long you have had ie9 , so just asking![]()