David,
Thanks for the response. I've tried inserting the script I previously posted into a NSAppleScript module, including starting and ending the script with the alfred_script lines. Unfortunately, it still doesn't work. Upon triggering the script via Alfred, a dialog box should appear where you type a comment that subsequently gets appended to the end of a specific note in Evernote.
I have verified that the actual script itself works by running it in the AppleScript editor. The same script works as expected in Alfred v1. I have Alfred v1 running on one macbook and Alfred v2 running on another. Both macbooks are running OS 10.8.3, although one is retina and the other is not. I wouldn't expect the hardware differences to be the source of the problem, so I'm stuck believing that Alfred v2 is.
Thanks,
Steve