🚀 go-pugleaf

All straight lines in Illustrator appear crooked on my screen. This is hard to explain. I've been using AI since 1991 and have never seen this problem, which started happening out of the blue a few months ago, even though I have not changed anything on my system or setup. This problem doesn't happen in any other programs, including InDesign.

Examples:

Use the box tool to draw a box. The lines should be straight, but they are crooked. You know when you use the pen tool and draw a line without holding the Shift key, and the line is jagged where it isn't straight? Well, that's what my lines look like when they are supposed to be straight, like from a box.

The lines are also crooked when I draw with the pen tool using the Shift key to constrain.

Even the document frame is crooked. I took a screen shot of an example. Please see it at this link:

 <http://www.theheadbone.com/crooked.html>

THANK YOU for any help anybody can offer!

Victoria

Mac OSX 10.5.6
AI CS3. 13.02
Using MacBook Pro with Apple Cinema Display 20"