MIDI Drums not working in Matrix View

I'm using SONAR X1c Producer.

I've got a simple project with a MIDI track and EZ Drummer.  I've dragged a MIDI pattern from the EZD browser into the SONAR MIDI track.  When I hit the play button, the EZD receives the MIDI data and plays.

Then I bring up the matrix view and drag the MIDI drum pattern from the MIDI track to a cell in the matrix view.  When I click on the cell to play it, the play "circle" spins but I don't hear any drums.

I recorded some audio (guitar) and dragged that into matrix view.  When I click on that cell it plays just fine.  So what am I doing wrong with the MIDI track?

I also tried dragging the MIDI pattern straight from EZD's browser into matrix view, but that doesn't work either.

The output of the row is assigned to the MIDI track that is going to EZD.  Is there more I'm supposed to do?

I did discover that I could just bounce the drum track to audio and drag the audio into the matrix.

That's crystal clear, but probably not it :)  (and I very much appreciate your help with this, thank you!)

I already have the "Follow transport" set to off, so I shouldn't need the transport running.  What's really strange is I added session drummer 3 to the project and created a midi input track for it and an audio output track.  Then I went to the browser, grabbed a SD3 MIDI pattern and dragged it into the matrix.  That worked fine...drums coming out of SD3.

I've run into some strange things with MIDI and SONAR before.  Maybe this is just another one.  At least bouncing the synth output to audio is a reasonable work around.