I'm not sure if this is a bug in the Community Set or in Hero Lab proper, but feats in the latest update don't seem to recognize when Smite is available for the purposes of prerequisites (e.g. Paladin class):
https://gyazo.com/3e7d1c1d7c778680865322cfa14bd781
https://gyazo.com/b6ee4443bebc0991701eaee827d0b1ca
The only smite feat that does recognize it is Smite Fiery Foe in the Frostburn splat, but I don't know if that's a bug either.
Note: I found this while theorycrafting a Human Paladin 6. I can provide files if needed.