More about Groups.
In Moodle 3 they have made it super easy to change the group settings for any activity! With Editing Turned On, you may have noticed these small icons
= Visible groups
= Separate groups
= No Groups: this is the most common setting, and allows ALL students to see/access/post in an activityWith Editing On, you can 1-Click change these settings. I have discovered several situations where this was done inadvertently!
If students are having issues accessing and/or posting to certain activities, please check this icon.