I cleaned the app data and logged back in. Now it is working.Initially the tapatalk wasn't working for a few hours, because the plugin wasn't installed. However, I did that yesterday and since then it is working. In fact @adsatinder posted from it yesterday as well. Can you close the app manually through task switcher/manger and launch it again?
One more issue, earlier the actual reply used to be previewed. Now first the quoted is showing instead.