Well, seems like I'm not the only one with this problem. I did like you suggested, dear Lord, and download the last Java update as a standalone update. Quit all apps and started the installation. No weird messages saying it was allready installed or anything like that... It just installed fine and everything worked. But, I did not reinstall my 5.1.2 LW Pro version just to see if it worked now. Lost enough time allready But did send a nice mail to Apple France about this problem asking them to check what is send to clients.
But, I didn't have any problems with Safari 4. I don't use it too much, prefering Firefox, but when I use it, it works fine !
And, whre can I drop remarks about the LW 5.2.2 beta version and maybe do some suggestions to improve this horrible (and only partial) french translation ?

A nice day to everybody !