discrete graphis exporting to dxf, dgn

have 2 machines running 8.30.03.135 on XP that when exporting to dxf and dgn overwhelm fence diagrams (obliterate all other information).  Another machine running same gINT version on Win 7 exports them correctly to dxf but drops them exporting to dgn.

Where can I find propeties to control the behaviour? Is there something in the dgn seed file? different seed files are being used on the different operating systems.

Thanks