The 7.2.1 made a huge difference when batching with Waves plugins but I still have occasional crashes. They seem to be limited to when I have multiple (at least 4) batch tabs processing in a series.
I mainly use the X-noise Waves plugin (latest version) with other (non waves) plugs in my chain and when Wavelab reports an error, it is always referring to the waves plugin.
As I said, the errors are more seldom but only happen when there are multiple tabs processing.
The most common error is the “a serious problem with the plugin…” sometime the batch will proceed after Okaying the message and sometimes it will halt.
Hopefully this can be fixed…I was hoping to have a multitude of tabs open and batch them all in series.