1. Place a curtain wall from right to left and the exterior is above
2. Place a curtain wall from left to right and the exterior is below
3. If you place a panel in these curtain walls you will end up with the exterior of your panel in the right place (on the side that shows the up and down arrows for flipping the orientatation
4. If you place a curtain wall by face on to a Mass, the panel will be mirrored about the centre. Therefore everything that is on the left of the panel will be on the right.
5. If you flip the wall so that the exterior and interior swap places, the panel will be correct. However you will then have to rotate the wall by 180 so that the exterior is again on the exterior. The face will no longer be updated to the mass
6. Drawing the wall normally (without putting it on to the face of the mass) makes the curtain wall panel correct and the exterior is identical to the exterior of the family.
I am sure there is a solutiont to this but I have not been able to find it. I am guessing that the solution is within the panel family that we have created.
Since writing this I have discovered that if you place a flip control in the family you can flip the panel in the main model curtain wall. This does not explain why there is a difference between placing a curtain wall on a mass and placing a curtain wall normally.
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