The latest 19th edition of Kourovka Notebook (Unsolved Problems in Group Theory), Novosibirsk, 2018, has just appeared:
Unsolved Problems in Group Theory. The Kourovka Notebook. No. 19. (see the new updated version in a later post)
This 19th issue contains 111 new problems and a number of comments on about 1000 problems from the previous issues. The section “Archive of Solved Problems” includes all the solved problems from the previous issues that have already been commented on in previous issues, while new solutions are found among unsolved problems in the corresponding sections.