I don't do a lot of scripting, but every now & then I end up delving deeply into an automated solution for something that I then trigger with FastScripts (v2.6.5).
My specific issue is that one of my Address Book.app (excuse me) Contacts.app scripts now fails with an error when triggering it from FastScripts. The error is, "Error Number:Contacts got an error: An error of type -1743 has occurred. -1743" popping up in a dialog box titled "Scripting Error" with buttons to "Edit Script" or "Close". No errors (that I can see) appear in Console.app.
However, when I "Edit Script" and run the script from the open editing window, the script runs as expected.
This behavior certainly started after the upgrade to Mavericks (10.9) (and may have been present in Mountain Lion (10.8) as well--I can't remember).
I can't seem to find what error -1743 is, and I'm not certain if it's FastScripts throwing the error dialog box or if it's a system error dialog box.