Again this may be old information for some, but this still could help some people out there. Since I have upgraded to Mountain Lion, there is some major changes in which the way to run scheduled Apple Scripts. I have numerous scripts scheduled previously in Lion. Within Mountain Lion when you have a script scheduled it loads Applescript Editor instead of running the scripts.
I have previously read and mentioned that if you save the script as an application then it will work, I found this not to be the case.
One thing I did read is to create a workflow in Automator to then call your application, this seemed to add another step, and then there was one more thing to remember about and maintain.
The choice I made was within Automator, Select Calendar Alarm. Once that window is Opened, from the left hand search panel, type Run Applescript, you then have the screen below.
Once you have this window up, you just copy your Applescript into the window, just replace the line (* Your script goes here *) with your script.
Once you have your script in there, click compile, then select Save from the File menu. Once you give the entry a name it will automatically load iCal so you can schedule your script.
I am always interested in your thoughts so if you have any comments or feedback then please feel free to add any comments, or you can mail me here