I love the new grouping feature in node-red (v1.1.3), but besides the "freeze" problem with cut&paste (as already addressed in another topic) I found another issue with groups.
When using groups->'Merge selection' to merge an existing group with some other (not grouped) nodes the existing group looses all it's properties like name and color.
When dragging the (not grouped) nodes into the group this does not happen, but in this case the editor sometimes freezes too.