There is no automatic lockscreen mode in Timenow. You always have to manually lock your phone with the slider from the desktop. After that, when Timenow shows the lockscreen for you automatically, it should blank the screen automatically if you cover the proximit sensor again while the lockscreen is showing.

After uninstalling can you describe with more words what exactly are you experiencing and what you expect to see. I'd like to help, but I don' t understand your problem exactly.