Today I tried to compare OpenOffice Portable 3.2.0 and LibreOffice Portable 3.3.3.
When I'm starting first LibreOffice, then OpenOffice, everything works.
If I'm doing it the other way, the LibreOffice Portable launcher gives me an error message that another instance of LibreOffice is already running.
I checked also for the setting "SinglePortableAppInstance", but its not set.
Is there a way to "activate" the possibility to use multiple Instances of LibreOffice?