In the Active Roles 7.0 Web Interface, when attempting to add a user to a group with an Approval Workflow in place, and specifying Temporal Settings, the user is not added to the group and Approvals are not sent to the designated Approver.
1) Add the User to the Group using the MMC;
2) Disable Approval Workflows;
3) Do not specify Temporal Settings.
This Product Defect (TF00635562) has been fixed in the latest available maintenance release, you can get more information from its ReleaseNotes:
Active Roles 7.0.3 - Release Notes