Hey Tripi,
This has actually been a problem for me with the AU plug. too. I get quick stutters and dropouts with tempo changes. BUT, when I print to audio, everything sounds fine. It's just playback that suffers. Definitely annoying, but not as bad as it would be if things recorded that way!
I haven't switched over to the MAS update yet. Waiting for things to slow down a bit before I take the plunge. Other than the tempo issues, have you noticed any significant performance enhancements? I'm hoping that my stuck and missed note issues go away.
Working ok for me so far, with one major exception: tempo changes are causing drop outs and clicks. I have a dense orchestral cue that plays back perfectly, right up until a ritard near the end. It goes from 74bpm to 50 bpm in a slow ritard. As soon as it hits this point in the conductor track, I get all sorts of pops, crackles, dropped notes. I verified that it plays back fine using the AU plugin. It seems to have only started on the MAS version (which is awesome btw!).
Anyone else encounter this?