What version of LV are you using? Can you post your VI? I would be happy to take a look see.
Is it possible that you turned scrollbars off?
Got to VI Properties>>Window Appearance>>Customize and make sure that the checkboxes next to Vertical/Horizontal Scrollbars are turned on.
If you are using multiple panes you may have to turn scrollbars on individually. You do this by right-clicking on a splitter and selecting the visiblity of the scrollbars on a per-pane basis.
Finally, if you have set the option "Fit Control to Panel/Pane" this can also turn off your scrollbars. Again, you can just reenable them via the VI Properties box or the splitter popups.
Jeff Peters