3D mouse graphics problem

Hi,

I recently installed V1R3 x64 and have noticed a repeatable graphics issue with using my space explorer 3d mouse.
If I open a file and navigate using my regular mouse everything is fine, all graphics are displayed, but as soon as I touch the 3d mouse all entities dissapear unless i move the cursor over them in which case they reappear temporarily. This happens even if I click away from Draftsight and use the 3d mouse in another program.

I have a clean installation of Draftsight (as I have already fixed a problem with making DS the default for associated file types).
I have never had problems with this in previous versions.
My graphics card is an ATI Firepro V3750.

Any ideas?