I have script that launches gnome-terminal with few tabs
load_server_list
i=0
cmd="$(which gnome-terminal) --geometry=158x53 --maximize"
while [ $i -lt ${#servers[@]} ]; do
	if ${autorun[i]}; then
		cmd="$cmd --tab -t '${descriptions[i]}' -e '$DIRNAME/conshell.sh ${servers[i]}'"
	fi
	i=$((i+1))
done

eval $cmd

with gnome-termonal 3.10 this script sets tab titles properly, but with 3.12 titles are blank. Looks like gnome-terminal ignore -t flag and and tries to take title from shell. But in my case I use custom script instead shell and title stays blank.