USB device left click works in vvvv to select things but isn't registered by Mouse"system Global) Node?

My USB device is a button, I set it to emulate a left mouse click when pressed.
I run vvvv, when I hover over a node and click my USB it selects it, ie left click is being received in the program and works.

But when I use a Mouse (system Global) Node it doesn’t register it at all even with a TogEdge. The same thing happens if I set my USB device click to register as a keyboard press.

hm, strange. no idea.
but maybe you could get your device speaking via the hid-nodes.

also sounds related.