New update for “Unsolved problems in group theory (Kourovka Notebook)”

New update for the current 18th edition has been posted at http://arxiv.org/abs/1401.0300 .
In addition, for convenience of the readers, all the changes made since the 18th edition first appeared are also listed separately in 18upd-e . We thank all the people who help us keeping Kourovka Notebook up to date.

Evgeny Khukhro khukhro@yahoo.co.uk and Victor Mazurov mazurov@math.nsc.ru , Editors