for what it's worth, i tried two things... in this order.
#1. (taken from another search)
https://forums.adobe.com/message/6482350
a. clean uninstall of the desktop video 10.0.1
b. install of the desktop video 9.9.3 (at this point transmit doesn't work)
c. installation of the 10.0.1 over the 9.9.3 (with no clean uninstall)
this may or may not have helped the situation...
#2. it appears (also mentioned - er "argued" - in other threads) that this situation doesnt like "non-standard" frame rates. simply changing my AE composition from 23.98 to 23.976 immediately fixed the problem.