Hello,
After downloading your program again (I deleted it a year ago) I was rather unpleased to see it is bugged.

When I run the JAR file i get an empty error, no option to quit the application and none of the buttons do a thing.

I was thinking you might've wanted to know that

---The attached file contains a screenshot of the error; no buttons work in it---

It's the mystery error message

Can you post here the file "error.log", if it exists (of the end, if very long) ?

There is no such file in the program's folder.
All I can tell you more is that
-I launched the .jar file
-Using Mac OS X 10.6.8
-Error happens in "ss.Main"
-Buttons are unclickable
-Quitting the application is impossible(except for force quitting ofc)

No more idea for now.
How do you know it happends in ss.Main ?
In the screen shot there is no button - where do you see some ?