I've had people with screen related issues contacting me (their screens just stay black). After a quick round of trouble shooting, I traced it back to the updated XBV, so thats been ditched. To downgrade run:

cd /etc/xbv/
rm -rf ./xbv
wget http://gentoox.shallax.com/patch-files/xbv2.tbz2
tar -jxvf ./xbv2.tbz2
rm -rf ./xbv2.tbz2
rm -rf /etc/conf.d/xbved3

Sorry if this has caused you any trouble!