I recently re-installed SA on my iphone in order to fix a known problem (SA alerts received via email fail to open the corresponding article in the SA app, articles missing in SA app).
Since then, I can't log into SA app anymore. When entering my email address, SA asks me to enter a password in order to 'create a new account'. So clearly SA doesn't recognize the email address as an existing one.
I've had that problem forever on my ipad, now it's the same on the iphone. No problems logging in and out of web version.
Hint: 1 or 2 years ago, I changed the email address associated with my account, and I wonder if that is the root cause of the problem.
Customer support service by UserEcho