Me Too;
I'm having the same error that my Username and PW are empty or not correct and I uninstalled and reinstalled several times but same error. Once, it did open the selection box to pick a subtitle, but the 97 entries it found were not for the movie I was watching. Then when I tried again, the error of empty UN and PW came back.
Using Kodi 17.1 and SpinzTVpro lite and Exodus. I didn't try other streaming services.
Do happy I'm not alone, uninstalled and reinstalled 3 times, tried multiple username and passwords, nothing works. Do 3 quick searches in a row canceling the error and researching again brings up 9 pages of subtitles that have nothing to do with the words I searched for, doh!