Slidejoy - Stopped delivering ads, counter not updating

Slidejoy is an app that pays cash to view ads on your smartphone. Very convenient.

But suddenly it stopped showing ads and the score counter did not update. Things looked fine,  no errors were displayed. 

It turned out that I had changed the Facebook password and I needed to log out in the Slidejoy and login again as Slidejoy used the Facebook credentials. After doing that it started to work again - new ads were displayed and counter incremented.