Can't switch on extruder by clicking on icon and cannot set temperature through GUI
I'm using Repetier Host for Felix Printers v 1.6.2 for windows (7), this is the latest version, been using it for 3 years at least.
I can no longer switch on the extruder heater by clicking on the icon, the red slash stays there, and i cannot set the temperature either, it remains at zero. If i enter 205 and click enter, the display comes back to zero. Can't click on the up and down arrows either.
But the extruder and thermistor work, i can send manually the GCODE to switch on the extruder and i can print this way.
But would really like to solve the GUI problem. The other icons work, for example the bed heater.