No scroll bars, no problem!
Since the introduction of OS 10.7 (Lion) Apple thought it would be a good idea to hide the scrollbars and have them appear only when needed. This seemed to be great at first, but most of us quickly found out it posed a big problem when trying to navigate and use certain applications e.g. PowerTeacher Pro. Here's how you get your scrollbars back:
Select System Preferences from the Apple menu at the top left of your screen.
Select General from the System Preferences window.
Choose Always from the Show scroll bars option list.