3D head is no longer displayed

Windows installations

3D head in VHIT, Kalorik, ... cannot be displayed

Only the display of the 3D head is affected.
Measuring functions are not affected by this.

Measurements can be carried out.
If a calibration of the head is necessary to start the measurement, the calibration can be carried out by clicking in the area of the 3D head (or the error message).

Deactivate the "Optimization for window games".

The item can be found in the Windows system settings under
Screen → Graphics → Default graphics settings
to find.