Javafx applet with preloader crashes under Windows / Java7u7 / Chrome

I've got an applet that works fine under Firefox and IE8, Windows XP and 7 and fails with Chrome (under Windows 7 and XP).
The preloader is started, asking to execute.
=> click to execute
The main application asks to execute
=> click to execute
Some tasks are performed properly, then the applet crashes and reloads.
I can't see exactly what happens, first I thought it was about a scene change, but affecting new scene only happens after several logs that don't appear.

What other precisions can I give...
We have many JS / applet interactions, all JS calls are surrounded by try / catch statements. We catch exceptions only when applet was destroyed and we refer to it.
We perform https requests to the facebook graph api, have SSL connections...
We set the securitymanager to null...
We log all outputs (out and err) and have higher level logs : absolutely nothing related to the crash appears there.

I'm not familiar with jre logs so I don't see what is unusual in it, see logs of the first executions (preloader and real applet) before reloading.

Does someone identify this bug ?