Dear Xara...

I happened to make a 4-sided QuickShape and Preview it.
By chance it was Polygon, Starred, Curved.
Bug - It simply is not published.

I changed it from Curved.
Bug - Still missing.

I changed it from starred.
It appeared.

I changed it to Ellipses.
It appeared.

I changed the original to 5-sided.
It appeared.

Xara - The Great Escape.xar.
The two red shapes are Images. The blue square is a Transformed Span.

It all rendered properly in earlier versions.

Acorn