Hi @liamrobertsSP ,

>>>>>it leaves the parameter grips behind, as in they do not move with the center of the block.

Which grips do you mean? Can you mark them on the screenshot?

>>>>>>>>>Also when I insert it from the block library the attributes for dimensions do not update upon regen. This will only work if I copy and paste the block within the drawing. 

This is because you cannot create correct defaults for the attributes on Mac and I used workaround - set values of the attributes after I inserted it to the drawing. So these attribute values only work for the specific instance of the block for which they were set. You can copy this block inside drawing or copy-paste it to another drawing.