defining grouped object base point to pivot

[AlwMVMO]

I am getting the same thing your are. Once you set the base point for rotation, that Group can be rotated multiple times around that base point.  But I know that isn't what you want it to do. I guess DeltaCad had their reason to do that.
If you go to the Edit tab and click the Edit button [E] and change the angle value of the Group it will rotate around the base point that you selected when you created the Group.
If you could write a Macro you could use the dcSetSelectBase function to set the base point then use dcRotateSelObjs function to rotate the Group.
Alan