Tadjio wrote:

Today, running my trusty Piwigo for iOS 2.0 I realised that only the first image thumbnail from each album was being displayed.
I unloaded the app (double-click and slide-up) and all was well again :-)

I had the same error today. I had to restart the app and then everythings works well again!

Hoser wrote:

The app was backgrounded all night, then in the morning when you foregrounded the app, only the first image in each album was displayed?

I think I know why.
([Github] Piwigo-Mobile issue #61)

Thanks!

In my case not all night, but a longer time.