I had another post on the forum about being forced to mix outside of vegas. I'm not sure if it has to do with the magical latest update provided but I'm surround mixing with many tracks, panning all over the place with ambiences, Sound FX and music and not a single problem yet. Mind you, I'm using CPU instead of GPU under the preferences.

Loving vegas even more and not having to leave it for other tasks. Thank you Vegas team, keep up the great work.