Reconcile the font size with the screen resolution.
If you select a font size that is too large, this may happen. You should not change the properties in the screens.
Also check if these links could be of help.
http://www.stechno.net/sap-notes.html?view=sapnote&id=638074
http://www.saptechies.co.in/t588m-missing-scroll-bar-fields-detail-screen/