FischerRandom castling

I'm playing a FischerRandom game here and want to castle, but the program doesn't seem to know how to do that correctly. It's just letting me jump the king over the rook but isn't repositioning both pieces to the normal castling ending squares as it should be doing. What gives?

No castling in Fischer Games yet despite a lot of support for the suggestion...

we could float this, since it is a quite frequent question...

It would be nice to have this working properly.