Android Devices Won't Access ("Wrong username or password")

[dgood54]

Everything was working fine when both my Samsung Galaxy S5 Android phone and Samsung Tab S tablet suddenly will not access Subsonic, complaining about "wrong username or password", even though I can log in via the Web using the same username and password.

I've uninstalled and reinstalled DSub. I've uninstalled and reinstalled Subsonic on my PC. I've installed Subsonic on my phone and tried that. They all fail with the same "wrong username or password" message.

I'm having withdrawal pains; I need my Subsonic!

Any suggestions?