Ok, "emerge -e world" completed successfully. Bad news: X still crashes when scrolling in Mathematica...
On to the downgrade of xcb then, as much as I'd rather not do that. As suggested, I would edit the world file to remove main X packages and then use emerge --depclean to prune out the danglers. As someone who has never done this before, I got two questions: 1. The easy one: where is the world file located these days? 2. The hard one: which packages do I remove from the world file to clean out anything X-related? I read of a suggestion to remove "x11-base/xorg-x11" and the rest would follow from depclean... Is that too optimistic? Thanks, Denis
