Why has my Amazon app store stopped working on my Z10?

So yesterday i updated officially my z10 to 10.3.1
Today i activated the amazon appstore and it wont work
I CAN GET IN THE APP BUT (except for the banner - free app today) EVERYTHING IS BLACK WITH A WHITE SPOT IN THE CENTRE as if it was loading - same happens when i search for app or go to categOries other thsn home
app asked for updates, installed them, still nothing
I tried to reinstall the whole app, wasnt possible
I restarted my phone, no change
I thought it was because i've just created the amazon account and maybe needed to confirm it but it doesnt seem to be the case since i received no confirmation email to my address

Can someone help me? :)