I have had at least 6 computer collections completely vanish from my SCCM console (or at least go non-visible). I had an issue with the database drive being full but I have fixed that (and limited the size of the ReportServer DB to not let it use all the space). I can still see things (software updates) targeting those collections but they are unable to be seen in the console, anyone have any ideas?

That's really hard (or impossible) to tell without sitting in front of the system because that's a very specific issue.

I am willing to provide more info if you can tell me what you want/need, and yes it is a really weird issue.

Just checked that, no one has deleted them.

Solved!  Somehow the collections had moved themselves into the root devices collection.

• Marked as answer by esteagall 15 hours 10 minutes ago

This usually happens if the folder they are member of was deleted.