that's weird, i just tested it on samsung galaxy s2, s3 and kindle fire. also on the ipad... all were good to go.
I released another update today for 4.4.25, try that one to see if it solves the "chat" covering issue and let me know since it was never an issue on my tests.
Also, make sure to go to calibrate and put the sensitivity to half of the bar, otherwise it may be too sensitive. The joystick is the one that drives me confused... uncontrollable rolling doesn't make sense