SM-N9100 - Unfortunately eBay has stopped error message, factory reset does not fix

hi,

I have a hong kong N9100 running stock 5.01, and the ebay app always errors after a few seconds when entering user id.
I have tried many combinations of : installing an older APK, factory reset, reinstalled OS using Kies, cleared cache, deleted app data, moved app to SD card.
The issue still persists.

edit : stock 5.01 includes GAPPS, so no skulldugger is necessary to install

Does any one have any tips pls.

Also, is anyone using this phone with the UK ebay app working OK.

Perhaps I need a custom ROM :(
cheers