Dear Xara...

So playing with v16.0 XDPX, I produced an extrusion and added a shadow.

When I mouse zoom the design page, I get the following results:
  1. 5% to 25% - Wall Shadow, as designed.
  2. 32% to 80% - spurious shadow, almost like Floor Shadow.
  3. 100% - Wall Shadow, as designed.
  4. 125% - spurious shadow, not casting to the left.
  5. Above 125% - Wall Shadow, as designed.

With the preset zoom factors, I only get the error at 50% as the other value are not in the list.

All works as expected in v15.1.

Me and My Shadow.xar

Acorn