I guess that red X means a login error...
Please note that login for this forum
and for the subtitle site
are two different
You can not use the login for this forum for getting subtitles.
So, make sure you register on the subtitle site:https://www.opensubtitles.org/en/newuser
and use those credentials.
This issue was fixed by Popcorn team by upgrading their software. Read here: https://www.reddit.com/r/PopCornTime/co ... corn_time/