I am using eXT VSTi (beta 12 May) and have run into a small bug:

In the main eXT window, create a new Audio Part, then, without opening it, add another audio output channel - this crashes eXT VSTi and (in my case?) the host.

- - if I open the Audio part, close it immediately, then Adding Audio Outputs in the Main window is fine
- - if I open the Audio Part, then Adding Audio Outputs from the File menu is fine.

I can confirm almost the exact same behavior in the stand alone.

It does, in fact, report the following: "Exception at 0003F3C7" each time you add an audio output (without opening the comp). However, when you click OK on the Exception message, it doesn't crash eXT & seems to work just fine. Even the new audio output seems to work just fine.

Other than that, all other behavior in the stand alone version matches your report.