script editor malfunction: window "smears" typed text

I am using Script Editor 2.0 on OS 1.3.9. While my active editor window is displayng compiled code, it frequently turns the text fuzzy. When I scroll up and down in order to refresh the window contents, the lines smear and spread all over the window. Quitting and restarting only alleviates the froblem for a short while. Has this ever happened to anyone?

Model: mini
AppleScript: 2.0
Browser: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7.5) Gecko/20041217
Operating System: Mac OS X (10.3.9)