After upgrading to Android 6 on an unrooted OnePlus One, some apps (eg. Aqua Mail, aCalendar) have their input fields nearly white text on white background.
How can I change the color?
I have an un-rooted android oneplus one and I recently upgraded to 6.0.1 I did not see any such problem in my phone. You can try following and see if it works:
Let me know if it works :)
Changing to another theme in settings -> themes did the trick