I had high hopes, though there seemed to be no difference in the post Javascript, but no - same issue. Thought I would post some details here of the machine definition, in case that has something to do with it.
And the error:
Information: Configuration: Mach4Mill
Information: Vendor: Artsoft
Information: Posting intermediate data to 'C:\Users\User\AppData\Local\Fusion 360 CAM\nc\1001.nc'
Error: Failed to post process. See below for details.
...
Code page changed to '1252 (ANSI - Latin I)'
Start time: Thursday, June 11, 2020 12:00:19 AM
Loading locale from 'c:\users\user\appdata\local\autodesk\webdeploy\production\1f559bb8ae333199306b5c4f1fe680c6eb7ab9e0\applications\cam360\data\posts\common.en.lang'
Code page changed to '20127 (US-ASCII)'
Post processor engine: 4.5663.0
Configuration path: c:\users\user\appdata\local\autodesk\webdeploy\production\1f559bb8ae333199306b5c4f1fe680c6eb7ab9e0\applications\cam360\data\posts\mach4mill.cps
Include paths: c:\users\user\appdata\local\autodesk\webdeploy\production\1f559bb8ae333199306b5c4f1fe680c6eb7ab9e0\applications\cam360\data\posts
Configuration modification date: Wednesday, June 10, 2020 11:20:02 PM
Output path: C:\Users\User\AppData\Local\Fusion 360 CAM\nc\1001.nc
Checksum of intermediate NC data: 7720f01aa8be9125834a39cad2271931
Checksum of configuration: 31497b50757641ec0e0985e56b643eb4
Vendor url:
http://www.machsupport.comLegal: Copyright (C) 2012-2020 by Autodesk, Inc.
Generated by: Fusion 360 CAM 2.0.8412
...
###############################################################################
Error: Error: Direction is not supported for machine configuration.
Error at line: 1
Stack dump:
("Direction is not supported for machine configuration.")@:0
onOpen()@c:\users\user\appdata\local\autodesk\webdeploy\production\1f559bb8ae333199306b5c4f1fe680c6eb7ab9e0\applications\cam360\data\posts\mach4mill.cps:220
Failed while processing onOpen().
###############################################################################
Error: Failed to invoke function 'onOpen'.
Error: Failed to invoke 'onOpen' in the post configuration.
Error: Failed to execute configuration.
Stop time: Thursday, June 11, 2020 12:00:19 AM
Post processing failed.