Certain currencies freeze the app when added to the Rates page. All conversion ammounts disappear. Only possible to remove by logging out and resetting the app. Haven’t tried them all but some 1:1 pegged currencies - GGP, JEP and IMP definately cause a lock up whilst GIP and FKP do not. First reported to support on 2nd August 2016 but no solution yet.
Thank you for letting us know - have you tried to delete and reinstall the app?
Tried deleting and reinstalling and it makes no difference.