I can not duplicate this issue so far...
below you will see a screen of the Ez Shout, with the default theme, set at 80% wrapper and no H bar. tried with my themes,,,the same..Please note, that ezPortal inherits the CSS of your current theme , so this should not be an issue with the portal. but possibly with your theme.
In your theme's css, check to see, if it has some margins set in the in the:
input, button, select, textarea
( special note to the textarea
!) also are there additional, padding setting there, should a low number like 2px or so
If it does, you can tweak that, to a lower setting, till the bar goes away.EDIT
: Sorry for the late reply! Busy Busy!