Since LDStructure uses LDVLib.dll for its rendering, I think that the LDraw directory set in LDView isn't right, while the one in LDStructure is right. (LDVLib.dll is a DLL-based copy of LDView's rendering engine, basically a DLL wrapper around the exact same source code used by LDView itself. So it should produce a 100% pixel-perfect duplicate of what LDView produces, when set to have the same options.)
Knud: In LDView, select File->LDraw Dir..., then make sure it's set to the directory you have set in LDStructure. If it looks like it's the same, please look very closely to be absolutely sure, because I've had people in the past say their LDraw directory was set correctly in LDView, when in fact it wasn't.
Knud: In LDView, select File->LDraw Dir..., then make sure it's set to the directory you have set in LDStructure. If it looks like it's the same, please look very closely to be absolutely sure, because I've had people in the past say their LDraw directory was set correctly in LDView, when in fact it wasn't.