Dwg Seed & Acad 'Display Resolution'

Hi,

We have been having problems with our linestyles not displaying in dwg true view (and AutoCad).

After exporting dgn > dwg we generally open the resultant dwg in dwg TrueView2011 to check that our client will see the file as we expect them to.
I discovered in TrueView the exported file has a resolution set to 100 (TruView and Acad Menu: Tools>Options>Display>Display Resolution Arc and Circle smoothness)

When I change this to 1000 hay presto the linstyles display correctly.
Checking the DWGSeed file in TrueView  I found the Display Resolution is already 1000. This must mean it is being changed down to 100 during the conversion but I can't find where this is set in the dwg export options.

Any help is much appreciated.

Mike