I have just posted beta-11 of Email Users v4.6.3.  This beta version has quite a bit in it, new functionality and bug fixes:

• CSS fixes to the settings page so the Editor boxes don’t over flow into the right hand column.
• Integration support for the Paid Memeberships Pro plugin.
• Language file updates.
• Empty User Groups from the Groups plugin are no longer displayed when sending group messages or notifications.

Please do some testing with this build, I would like to release it fairly soon.  I have limited knowledge of Paid Memberships Pro so it could use some testing.  My experience with PMP is it is pretty fragile, I had to mess with my WordPress database just to get users assigned to PMP groups.