Emmanuel,

I don't know where else to look.

I tried starting with OpenJDK Java, but that doesn't give any result (I think).
When using the Sytem Monitor, there is a popup window with a lot of information. Maybe that info is useful for you?

EDIT
A small experiment: I draw a wall, use CopyAsNewFurniture. The moment I click Paste to insert the copy, the program crashes.
END EDIT

Hans