When a hoist is inserted into a document the "Measure From:" X & Y dimensions are locked into the units that were active when the hoist is placed in the drawing. If the units are changed for the document all of the other dimensions or settings in the Hoist OIP change as expected, but the X & Y in the "Measure From:" section stays unchanged. Refreshing the hoist does not solve the problem. I have played around with this enough to know that it is definitely a problem that needs VWs attention.
I guess I will wait until the next service pack as this greatly affects my workflow.
UPDATE: It seems that those dimensions aren't even updating when the hoist is moved from its insertion point. This seems to be a major issue within the hoist plug-in that may render the use of the Hoist Origin useless if you move or adjust anything.