App created with Launch4J runs - but not on German Win 7.

[CasaDelGato]

I have a large java app built with Launch4J that works fine on every system I've tried - except for the German Win 7 x64 installation. (also fails on Spanish, haven't tried other non-English systems.)
On that system it doesn't work.
And that means running the .exe just immediately returns to the command line.
No apparent java task in Task Manager.
I tried adding --l4j-debug to the command line, but I didn't find any sign of a log file anywhere. (Just where is it supposed to be created?)

Any suggestions on what else to look into?

[Grzegorz Kowal]

Hi, the log is created where the executable is. So if the folder requires administrative privileges it may not be created. You can try running the application as admin or move it to a different folder.

Grzegorz