I use on 2 sites. on one it seems fine. the other no scheduled or run now

I set this up on another url with dropbox and it seems to be fine. on the 2nd site it is setup but never runs scheduled backups. when I click run now the page refreshes and says at the top its run but down in the the "all snapshots" section of the page I don't see the normal running now message with link to view log and such. As far as I can tell just nothing happens