Using latest XP12 release, latest RXP (2.5.1.0 / 2.4.23.0), and flying an MP A36 w/six pack (a Bonanza), the vertical CDI is not showing up. This is during the 530's self-test at start-up, as well as in flight when flying precision approaches (RNAV LPV as well as traditional ILS).
Basic settings from the RXP GNS 530 are master, connect GPS to AP, connect GPS to HSI, connect HSI/OBS, and connect CDI mode to NAV/GPS Switch.
I am also running with a RealSimGear GNS 530.
At one time, this all worked together nicely. Not sure when it stopped - I started practicing with my sim again a month or so again.
Thanks for any suggestions.
Erik