Gumtree 1.6.5 crashed during launching

Gumtree was installed with the installer. Launched OK for the first time, then start crashing when launching.
It looks like a privilege issue. Sometime it is OK to launch with administrator privilege. For example on ics1-test.
The current solution is:
add the following parameter to the Gumtree launch .ini file.
-Dosgi.locking=none
But this doesn't resolve the problem for some computers.