Multitrack Export Mixdown in Audtion CC 2018 build 11.0.0.199

I have a mid-sized session with about 40 five minute wave tracks and 26 bus tracks with effects like mastering and multiband compressors on the bus tracks.  The Multitrack Export mixdown of the entire session is producing nothing but a noisy, static sounding file that has a different duration than my session.  There are no sounds from the session, just some random noises that has a blockish wave form.

I installed the previous version, CC 2017.1.1 build 10.1.1.11 and the exact same session exports perfectly fine with the Multitrack export mixdown in the 2017 version of Audition.  It seems to just be broken in the 2018 version.  The session was created in the 2018 version.  In addition, bouncing the bus tracks in CC 2018 works on some tracks but not all.

Any advice as to why this works in the 2017 version but not the 2018 version?