I had an issue about half an hour ago. I was using a 10Harmonics contraption, and had assigned each harmonic amplitude to a CC knob. I recorded automation on eight of the harmonics simultaneously. I played it back, and when the automation reached the time when I had stopped recording, the Harmonics contraption started making an awful buzzing sound. It did this twice, and it was fine once I disabled/re-enabled audio. or to manually moving the harmonic or gain faders. The visual waveform remained the same as I moved the harmonic faders. The frequency still worked, but the sound the contraption made was absolutely atrocious.
I ended up just creating a new harmonics contraption and copying all the automation over. Nothing too strenuous, but still a pain. Just thought you guys would like to know.
(If it has any bearing, I'm running 32-bit Windows XP.)