I had almost given up on this app altogether. The latest updates required me to sign in every time I opened the app - not acceptable. After reading the recent posts here, I deleted the app, then reinstalled. Now appears to work as expected and remembers my credentials even when I close the app and reopen it.

They need to fix this though since not everyone will read this (or related threads) and know that they really need to delete and re-install. The app reviews are showing that is the case...