Salut Stief! Well thanks for the offer, but I think this problem has to be specific to my config. I won't reinstall os x to fix the problem (if that's the problem, I doubt it as I don't install any unecessary progs on my 'puter and I don't play with the UNIX guts of the X... much). I'll see if the problem is still there with the upcoming of the panther this fall as I always do a clean install with a new OS.
However I think this is linked to memory as Java 1.4 seems to have a BIG memory leak with LW on my machine.

Bonne fin de semaine à tous

*edit* Félicitations on your 800th post Stief!