Tim,
What I just found was the opposite. The code I posted was NOT setting the newly cloned DIMSTYLE current at the end and if you run it in AutoCAD with the current dimstyle having overrides, then the clone comes in fine with no overrides.
If, however, you do the same process, but add setting the new clone current at the end of the code, then it takes all the overrides from the current dimstyle...the plt thickens...
Cheers,
Glenn.