After setting up Ubi successfully, you might still experience some difficulties on certain part of the screen. This could be caused by various reasons: uneven surface, different ambient light, strength of the emitter etc. That is why since Ubi 5.0, we add an option for you to fine tune the sensitivity of touch.
Here is how you can fine tune the sensitivity.
Start UbiService from Taskbar.
Show Advanced Settings.
Choose Calibration tab and turn on Fine Tune Sensitivity.
Click Start and follow the instructions.
After IR Preiview, a red cross will show up on a white canvas. Touch the red cross one by one with your finger.
Test again to see if there is any dead zone remaining.