Just last week I posted about groups and getting to know a number of problems related to using groups. Well we can strike one off the list now. Rotating groups was sometimes a problem because face based families would flip on there host if you rotated the group 90°. The wierd thing was, if you rotated 45° twice, it would be fine.
I did a test this morning by creating a group with a face based family and rotated it. Behaviour was as expected. I then installed Update 4, reopened the project and rotated the group, problem fixed!
Now, if you don't have access to subscription only updates relating to Release 2, don't worry too much, Revit 2017 is just around the corner and this will likely be part of it.