Ariel Software Campaign Enterprise

I have recently begun using Campaign Enterprise (10.2.113) and am having inconsistency with my images showing up. Currently, I am sending an email with a background image in a table. In testing, the image disappears. It is located on the local computer, where other images that I have used successfully are located. The very odd part is, sometimes the image comes through, other times not. Sometimes it only appears when I forward the email. Sometimes it does not appear when I forward the email. Any thoughts?