In a web graphic hosted on a Xenta Server, clicking to change a value displays the dialog momentarily, then it immediately disappears.
On a graphic when clicking on a setpoint a popup box appear and the value can be changed. However if the Java version is too new or too old, the box will dissapear within a second.
Make sure The java versions installed have been tested against the installed Xenta version.
If the wrong versions are installed, download the correct version and install it.