Well, thanx for the useful info.
I shall therefore stop bothering everybody with this (I'd gotten encouragement from some users at zeropaid.com, which made me think this was a general gnutella problem... Oh well !)

-As for Xolox being discontinued, I was aware of that. Only, after having tried 2 other clients, including BearShare, I'll find the user-friendliness of XoloX very hard to part with... (Oh well !, again.)

Anyway, thanx again.