I use examdiff pro to diff text file and save the unix diff file output.
Let's see the below picture.

From picture everything seems OK.
You'll see the the status which examDiff echo out to standard output during process.
Reading files...
Comparing files...
Processing comparison data...
Finally i found the unix diff file in the output folder and it's pretty complete.
But, when i deploy on the production environment.
It seems examDiff cannot process the output.
Please see the picture below,

The status missing about the line of "Processing comparison data..." and
I'm not found the unix diff file in the output folder.!!!
I already checked about the write privilege to output folder and the user have privilege.
What is the cause of this problem? Please help.
Note - I use examDiff pro version 64X on Windows 2008 R2 server(same both test and production environment).