** Using WeBWorK **

I've been making some homework assignments with WeBWork (though I haven't yet tried writing my own) and have had success with Calculus.

I recently started using the CAPA library with my Physics class and discovered a wrinkle. I cannot download a hardcopy of a problem set if any of the problems contain images (I was interested in the motion graphs in the type05 problems). It doesn't matter which question or what kind of image.

It displays fine on the screen, but can't generate a .pdf.

Can anyone help me or suggest where to look for information?