Persistent Pushover Problem

Anybody else had problems with Pushover stopping working over the last few days? Last message I got was at 0:00 on the 25th and NOTHING since then. The pushover dashboard shows the device last synced three days ago but looking at the app on my phone it doesn’t report any problem. I’ve tried force quitting it (no change) I’ve tried rebooting my iphone (no change).
In the end I logged out then in again and I got a “welcome to pushover” push…but no queued messages arrived. Does pushover work like that? Can I expect queued messages to pile in at any point?