Hi,
1) Have you tried using a different mouse to see if the message still appears?
2) Which SAS software and version are you using, e.g. Enterprise Guide 7.1?
3) What is the exact text of the message and do you have a screen shot?
4) Is the message definitely from SAS and not the Operating System, e.g. Windows?
5) Perhaps a full screen shot of the "codeline" issue might also help.
Regards,
Amir.