[Darryl Ramm]

If you use the keycode app you should see the following hex codes when you type on the keypad number keys...

kVK_ANSI_Keypad0 = 0x52,
kVK_ANSI_Keypad1 = 0x53,
kVK_ANSI_Keypad2 = 0x54,
kVK_ANSI_Keypad3 = 0x55,
kVK_ANSI_Keypad4 = 0x56,
kVK_ANSI_Keypad5 = 0x57,
kVK_ANSI_Keypad6 = 0x58,
kVK_ANSI_Keypad7 = 0x59,
kVK_ANSI_Keypad8 = 0x5B,
kVK_ANSI_Keypad9 = 0x5C,

If you see hex values like these... then the keypad is sending main keyboard number key values that will not work.

kVK_ANSI_1 = 0x12,
kVK_ANSI_2 = 0x13,
kVK_ANSI_3 = 0x14,
kVK_ANSI_4 = 0x15,
kVK_ANSI_5 = 0x17,
kVK_ANSI_6 = 0x16,
kVK_ANSI_7 = 0x1A,
kVK_ANSI_8 = 0x1C,
kVK_ANSI_9 = 0x19,
kVK_ANSI_0 = 0x1D,

I have no idea what your keypad is doing, some might be able to change modes, some not. I would hope not but it's an easy thing to confirm it's sending the correct low level key events.