Graphics bug making software unusable. "Ghosting" effect whenever scrolling through piano roll or tracks window

As stated in the title, a bug has started plaguing my copy of Logic Express 9 ever since I updated to Yosemite. Whenever I scroll back and forth through the tracks window or the piano roll, this sort of ghosting effect appears and makes manipulating anything onscreen impossible. I have found no other mentions of this problem on the support forums, but this issue has made the software completely unusable. Here is a screenshot of the bug:

If anyone has experienced this problem and found a fix, please let me know.

thanks