The lines I draw are blurry...what happened?

I have been using corel draw on a basic level for a few years.  I don't know all the ins and outs of the program but I do fairly well drawing with shapes and lines or manipulating images. 

When I opened my program this morning, the lines and shapes that I draw are blurry and pixelated.  I know how to import low quality images and trace them.  This is not the problem.  All of the lines that I am drawing in the program are blurry.  I didn't change any of the setting.

Does anyone know what this would have happened and what I can do to fix it?  Please offer any suggestions as I cannot work without this program!

Thanks so much!

Candace