AE comp stitching in AME

In the past, I used to use Media Encoder to stitch mulitple videos (AE comps) together.  The functionalty doesn't seem to work anymore.  I would click on a AE project and then it would ask me which comp I wanted to use and I click on the comp and then I could open up another AE project and select another AE comp, etc.  All I get now is a single comp and/or the spinning wheel.  Any insight on making this work!  I don't want to render out each one individually and then bring them into ME.