APhoto - Pen instrument anomaly

[foto-grafic]

Hello friends,
I use the pen tool a lot and find this:
-> start to create a path,
-> I click and create the first node,
-> then, I move and click (to create the second node and the first segment of the path),
-> should be contemporary - node and segment creation,
-> instead the node is created but the segment is not;
the segment is created only if I release the button or if I hold it down by moving the mouse slightly.

The question is: What is the cause of this behavior that I consider anomalous? Is it a wrong setting of some parameter or is it an APhoto anomaly?

Thank you so much for your cooperation and forgive the errors of my English ...

[Old Bruce]

I have a brief (less than a second) gap between the time I 'click for the second node' and the path appearing. This is using both a trackpad and a Wacom Pen and touch sensitive tablet. Your problem may be due to the type of mouse you are using, are the drivers up to date for what ever Operating System (Windows or Mac) you have? I am on Mac.

[foto-grafic]

@Old Bruce

Thank you for considering my question;
as described is both with Logitech mouse and with Wacom Intuos pro tablet, the drivers are updated and are on Windows 7 pro Ultimate.
So do you think that the (anomalous) operation is due to Windows?

Greetings and happy Sunday ...