After installing Alpha02 Standard Mill you may get the following error message when opening the software...
Run-time error '-2147467259 (80004005)
AddButton: invalid button bar ID
If so, continue past this message and go to...
Utils > Add-ins > Free options
where you will find the option "Convert Geometry to 3D Polyline" is ticked.
Just untick this option and press OK. Next time you open Standard Mill everything will work fine.