The Quick Reply window has been broken for a while. There's a workaround that has worked for some people, open Quick Reply, tap the window, type a word, nothing happens, tap the window again, type and see if it works now.
This forum app or regular app?Tried this and it doesn't work. Also cleared app cache and did a force stop.
That workaround didn't work for everyone and I'm not sure if it's working anymore. I recommend you to use the Android Central Forums app instead of the main AC app. Much better to access the forums.Tried this and it doesn't work. Also cleared app cache and did a force stop.