Hi Koby,
I'm sorry you're having that problem. There are two ways to add Employees to Groups. You can go to Settings > Groups or you can go to Settings > Employees. When you edit the employee, you'll see a Groups tab. Can you try adding them there and let me know what you find?
I'll make sure the development team is aware of this problem in the Groups settings.
Andrea Free
SmarterTools Inc.
877-357-6278
www.smartertools.com