Just downloaded the trial of Vegas 15 today. First thing I did is load up a project that had lots of Waves audio plugins in it. Tried zooming the timeline; guess what: GLITCHES. Tried moving the plugin window around on the desktop, and LOTS of glitches to the point where the audio just stopped playing. Changed audio driver to a non-ASIO and using an analog output....maybe a bit better here. Then I upped the track buffering and it got a little better (not as many glitches). So, did they address this issue, or not yet perhaps?
Here's a question: Since I've been running Vegas11-32bit (Waves 32bit plugins work great) and Vegas11-64 bit (Waves plugins don't work....still glitchy), I have both 32bit and 64bit versions of all my plugins installed on the same PC. So, how do I make sure that when I launch Vegas 15, it's only looking for the 64bit versions of my plugins? Unsure of how to identify this, other than re-scanning my VST folders and making sure to ONLY choose the 64bit folders.