no ideas - but I ran into similar issues in v13, on windows.

LEP calls to OS for file level actions (copy, rename etc) everything 
empty, everything "OK" - not so much.
Run *same* exact command line code from cmd.exe everything worked as 
expected.

On Mac - no issue.

On Mon, 4 Dec 2017 16:36:52 +0000, Adrian Boone via 4D_Tech wrote:
> Hi all,
> 
> We have a component which uses Launch External Process to call an 
> accountancy package (Moneyworks) via the command line (Windows and 
> Mac), and have just recompiled it for v16 (that's another story...). 
> Now, when any component methods which use LEP (i.e. most of them) are 
> called from another method in my test database, they always return 
> ok, and the output and error variables are always empty. There's no 
> noticeable delay in the debugger so it looks like the LEP call simply 
> isn't happening?
> 
> Now for the really weird part, I have a form with some common test 
> methods linked to some of the buttons - if I call the exact same code 
> with the same parameters from a button on the form, it works!
> 
> If I open the source code for the component, the methods all work 
> fine. I've tried setting the _4D_OPTION_BLOCKING_EXTERNAL_PROCESS 
> environment variable to both "true" (which is what I want) and 
> "false" immediately before the LEP call in the component, but it 
> makes no difference.
> 
> This is happening on Windows 10, with v16.0 64-bit, v16.2 32 bit, and 
> with the component compiled for just 32-bit, just 64-bit, or both.
> 
> Any bright ideas out there?
> 
> Thanks,
>     Adrian
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