[lubos_]

What is your phone model? I'll have a look and try to release an update. You can use any UK banknote.

(aside: one would expect a picture taking using camera app to be fairly trivial, but it is actually very challenging on Android, where each vendor implements it with its own little subtleties)

[dave2000]

Sony Xperia Z3 (recently upgraded to marshmallow 6.0.1)

[lubos_]

Just a quick check, if you click on three dots on top right and go to "About", does it say TakeMeasure 12?

[dave2000]

Yes, copyright 2014!

[lubos_]

I reproduced similar problem in Xperia Z3 on 5.1.1, which I was able to fix and release. Unfortunately 6.0.1 was not on device cloud. Nevertheless, I think there are good chances that update to v13 will fix the issue, in any case, please let me know.

[dave2000]

Yeah that's fixed it, thanks.

My wallet folds notes but the app is accurate if I try and make them as flat as possible first.