I too have been running all the BETA releases of the new MSM and have echoed all of the issues experienced which have all been fixed in subsequent fixes with thanks.
The latest BETA 9 release makes all my feed rates go haywire when previous versions where stable, i set it at 2500mm / per minute but it seems to disregard the feed rate and run at whatever it wants to the point i need to downgrade to the previous release.
I am not running any smooth steppers, just a plain vanilla install of the MSM packages.