I’ve tried deleting Avid Settings, User Settings, I’ve followed Avid’s own page regarding the “media streams” hangup where you delete the two types of .msm files they recommend deleting, and I’ve even uninstalled Avid completely and all associated folders as well as, on two separate computers, reinstalled Windows and then fresh copies of Avid.
Some of this seems to work for a few days or even a few weeks, but eventually, it hangs again for times as low as 7-8 minutes with several Avids booting for around 35-45 minutes before either finishing the application load or erroring out and closing.