Being a newbie, I think I posted my original report to the wrong place, so here's a link to it: http://lists.debian.org/debian-release/2011/01/msg00746.html
Summary: the current sudo has (what I view as) a serious regression which will break stuff, at least possibly any instance of sudo (X11 program) with default configuration. I'm also pretty sure that it's too late, but still worth a try. Regards Andrea Azzini
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