Add a confirmation window when enabling the Server Group setting on a collection. The placement of the checkbox is very similar to the Incremental Updates checkbox on the following tab. Have seen some admins enabling it by mistake, which causes problems.
Ralf Korte commented
Same for me. I would prefer to have this checkbox not on the first Page. Maybe on a separate tab!
I had this again last week, more then 1000 Machines had update issues and this box was checked by error.