I think I've found a bug, but not sure if it's with NVDA itself or
with the Numpad Nav Mode add-on. The easiest way to find this is by
doing the following:
1. On a webpage, use the letter C to navigate by combo box.
2. With Numpad Nav Mode running, press alt+numpad 2. Instead of
opening the combo box as expected, NVDA says "symbol263B." If you use
the normal arrow keys, the operation works as expected.