Beats me. If you ask the staff they'll want to know what OS, browser, ISP and hardware you're using.
changing chess mentor settings

Same thing is happening to me!!
You mean forgetting to describe your OS, browser and hardware? And when did the problem begin?
http://www.chess.com/blog/NimzoRoy/diagnosing-and-fixing-internet-problems?_domain=old_blog_host&_parent=old_frontend_blog_view
How come I have to keep resetting the sequential to the adaptive. It will not save the change.