LONDON (Reuters Life!) - Women bosses are no longer unusual in the corporate world, where many top-flight companies see gender and diversity programs as a "must-have."

Flexible working, parental leave, mentoring and women's networks have become the norm in many businesses.

But gender diversity's move into the mainstream gives an impression that gender issues at work have been "solved," which makes more subtle discrimination harder to spot and can even disadvantage young women starting their careers.