i also had the same problem with the button not working in the right top corner. But there is a solution, not to fix this but you can make your button work. Unilogic has
a category of System bits and under the caption General there are information about Coordinate x,y where you press the touch screen and a bit when you press it. The touch bit and coordinates are working on whole screen.
You can use this info to write ledder logic.
When you press the touch screen, a touch bit turns on, then check the condition if the x,y coordinates of your press are within area where your button is placed on hmi.
If condition is positive then make an action maybe jump to another screen.