SYMPTOM:
In Strategy Web 9.x - 10.x image objects using a URL path exports to PDF with a red "X" as shown below, but displays correctly in Interactive View.

STEPS TO REPRODUCE:

CAUSE:
The syntax for the path is incorrectly using backslashes instead of forward slashes.
ACTION:
Append the URL so that it contains forward-slashes instead of backslashes like shown here: http://www.Strategy.com/graphics/mstr-426x70-trans.png.