Every so often the void FingerEventHandler(char* idSensor, GRCAP_FINGER_EVENTS event) is NOT TRIGGERED.
My current workaround is to right click the Griaule Tools icon and select "Diagnostic" option.
After doing that, the FingerEventHandler is called when users put their finger on the scanner.
A little while later, it stops functioning again. Selecting Griaule Tools->Diagnostic makes things work again.
How do I fix this?