Matrix, Yatse, Kodi, offline, authorization bla bla keywords 
In case Google does index correctly this post, and supposing that users will eventually do a Google search
Kodi did increase security and forced you to update your configuration to enable back the web server without authentication, this is written in Kodi changelog, Kodi shows a popup on first start after update , Yatse shows a red warning about that and it’s covered in the FAQ.
If you have this issue just fix your Kodi configuration and enable back the webserver, either by adding a password or enable password less configuration.
And again no bad rating Yatse on Play Store will not serve any purpose Reading and contacting support on the other end have magical effects …