[libreoffice-users] Error: Another instance of LibreOffice Portable is starting

Hello. I get the following message when trying to launch
LibreOfficePortable.exe 3.5.4.2 from my program:

"Another instance of LibreOffice Portable is starting. Please wait for it
to start before launching it again"

I do need to execute several instances at once, and they do not conflict
with each other, but this message pops up from time to time. How can I
avoid it?

Sometimes it is shown even when I execute a single instance. LibreOffice is
being launched by my program only.

What I have already tried according to some advice:

- to delete App\AppInfo\Launch\LibreOfficePortable.ini (fails to start then)

- to edit it and Data\settings\LibreOfficePortable.ini by adding line
"SingleAppInstance=false" (nothing changed)

- to delete Data\settings\PortableApps.comLauncherRuntimeData (doesn't
exist)

- to replace the .exe file by some another fixed
version: LibreOfficePortablePAL211Beta.exe (didn't help)

Thank you for any help in advance.

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