2- Rax 3.0.0 build v3809
3- No sound from KarmaFX demo. Also cuts sounds from other audio units as soon as I use KarmaFX into a track
4- Use any audio unit instrument in track 1, you should get some sound. Plug KarmaFX into track 2, no more sound at all, but midi messages are still received. If you also try the opposite, it's the same, or KarmaFX by itself (any track) does not produce sound either.
if I replace KarmaFX by any other plugin, there is no such issue (plugin produces sound). Also, If I replace Rax by GarageBand, the same occurs, even though I can't verify that sound is cut since only one instrument plays at a time.
This is on Mac OSX 10.6.8