iSub stopped working

[tmwsiy]

Just curious about this.

iSub stopped working today for one of my users. I too, tried on my iPad and got the same results: It showed Zero folders.
Android apps were working fine. Desktop was working fine. Only iSub was not working.

A reboot fixed the issue: But what in the world could have caused a single app to not work?
Five other people were happily streaming at the time so everything else seemed to be working perfectly.