.jsx scripts open in ExtendSscipt instead executing when called from the command line

I've written a few ExtendScript scripts to perform applying camera raw presets to multiple files. These scripts are called by a python app.

Last week everything was working perfectly. Then my hard drive crashed.  Now I've got up and running again the scripts no not run when called by python. Instead they open in the toolkit editor.

How can I make them execute with a line like:

C:\myscript.jsx

.I know I can do something like 

"C:\path_to_bridge\bridge.exe" -r "C:\path_to_my_script\myscript.jsx"

 but this doesn't solve my problem.

Thanks