Amazon Prime Video won't play videos (D-pad center button does nothing)

Hi, just received mine here in Australia.
Netflix, Foxtel, Stan, SBS, ABC Iview are all working well (yay!)
The one persistent problem I have is Amazon Prime video.
I can browse the menus, but then get a message “Something went wrong. Please try again later. For more help go to amazon.com/videohelp

System version is 1.0.27

Amazon prime version is 5.1.3-googleplay-armv7a

I have tried removing it, reinstalling it, clearing cache, all options.

Is there an earlier version of the Prime app I should be using?

Thanks!