SDKERR_UNINITIALIZE on meeting join; worked yesterday

With sys internal’s Process Monitor I can see that it is loading all of the z* dlls in the SDK successfully (and Visual Studio also shows it loading those modules), and can also see it enumerating my Firefox profile directory (why???) and reading/writing these files before uninitialize is returned:
C:\Users\MyUser\AppData\Roaming\ZoomSDK\data
C:\Users\MyUser\AppData\Roaming\ZoomSDK\data\VirtualBkgnd_Default
C:\Users\MyUser\AppData\Roaming\ZoomSDK\data\VirtualBkgnd_Custom
C:\zoom-sdk-windows-master\bin
C:\zoom-sdk-windows-master\bin\zcacert.pem
C:\zoom-sdk-windows-master\bin
C:\Users\MyUser\AppData\Roaming\ZoomSDK\data\zoomus.db
C:\Users\MyUser\AppData\Roaming\ZoomSDK\data\zoomus.db
C:\Users\MyUser\AppData\Roaming\ZoomSDK\data\zoomus.db-journal

The db is a sqlite3 file but there’s nothing useful in there.

How can I find why the SDK is unloading??