Media Encoder renders test pattern

CC 2014 - latest build. When I choose to render with Adobe Media Encoder from AE, the Media Encoder renders a test pattern, not the video in the project. The files are on an external drive (TIFF sequence), but the timing for the project is correctly shown in the Media Encoder so I can see that that is correct. What s going on here? Same thing happens with any/all project(s).

Thanks for the help.

-dm