I made 4 apps for a Glide course. Did one term in march and started one this month.
Url’s in the course dont exist anymore, when I go to the admin section the apps are not published.
But they were published.
This is related? My apps vanished!
Yeah, it is. Glide should not do this without letting the owners know, though 
I’m sure they didn’t mean to cause any issues. They are, I’m sure, very busy, hopefully it won’t happen again 
You will have seen “Not Found” on the screen for these “lost” apps. Search those words on this forum and you will find a full explanation for what is likely a dormancy situation.
Cheers