I did a fresh install of WP4.2 today, but after playing for a while with setting up a custom user roles I realized that the built-in subscriber role is returning blank page instead of the dashboard.
Do you have the same problem?
I found an answer. It is because the WooCommerce plugin which prevents users without edit_posts capability to display dashboard.
Well, I think they should let you know that they are making this kind of change in WordPress default settings. Because you are not able to turn it off in WooCommerce settings.
view => true
to the user role. Read more