Hi Fabrice,
Some buttons, as the Start button, that when unintentionally pressed may lead to a crash or accident, are protected by a safety timer.
You have to keep the button pressed for the specified time. If you release it before, the event will not trigger.
The default time value for the Start button is 500ms , and when in step mode 200ms.
You can change that to the value you preffer in the RUCONFIG.INI file.
regards
PD: The screen aspect is designed for 1280x1024 screen resolution