I have been using Rapture 64 (Full Version) for over a year now with no issues. But took a two month break for work. After starting a new project the other day, I noticed something strange. During a level mastering session, with a particular section marked for looped playback, the Rapture tracks would ALL occasionally drop out. That is, they would not make sound at all. It seemed to alternate between every other loop of the section. One time through, it makes output, the next, nothing, rinse and repeat. I have double checked for the presence of automation or unintended events in the event list. Nothing. Even if there was something present, wouldn't it take effect with evey iteration of the loop? None of the other soft-synths or Session Drummer 3 are doing this. Only Rapture. Why would it drop out, and then back in like that, and why all of a sudden?

Is your system online ? Could be doing some sort of auto update ?

Have you just installed anything new ?

Or you can try - 
to prevent drop out / audio engine stop
 - increase msec, inside the 
   Preference, Configuration File, DropoutMsec  (default is 250)

No. Nothing new, not online, and it's not the usual midi "drop out", everything else keeps playing. No errors are generated. It just stops outputting sound. Again, only on every other repetition of the loop points. Like, every odd rep it sounds, on evens, it doesn't. Zeta, SD3, and other things don't do this. Just to be certain though, I checked my settings, and everything looks fine. Even if I switch from asio back to soundcard (bleh) it's the same. Everything is good except Rapture. No actual "drop outs". I thought at one point that maybe it's hitting a total note capacity, but the sound has little to no release time and no more than 3 to 4 notes at a time. So that isn't it. The sounds I usually use typically use no more than 2 voices per patch, though sometimes 3. I'm really at a loss here. The strangest thing of all is that it's just started doing this. =/

You can try to mute all other tracks and see if Rapture still does that.

Try to quantize the Rapture track.

If not, you can post a midi clip and patch name / tempo, so we may test the problem ?