Hi Kika --
Like you and Jrsy, I, too, have a non-working space bar when I click F6 for "num lock."
But, I think there may be a possible work around. It's not pretty but it might do what you what and it involves using the "Keyboard Viewer."
Here goes:
If you don't already have the "International Input menu" menulet enabled, please do so by going to System Preferences > International > Input Menu.
Put a check mark next to the box that says "keyboard viewer." Also put a check mark next to the box at the bottom left of the preferance pane that says "Show input menu in menu bar."
There should now be a little American Flag next to the Day/Time in the upper right-hand corner of your display. Click on the flag and select "Show Keyboard Viewer."
A little graphic of your keyboard should then appear on your screen. Each time you press a key on the real keyboard, you'll see the key depress on the little Keyboard viewer.
OK, so far so good.
Now press the F6 key for "num lock" mode. When you do, you'll notice most of the key functions of the Keyboard Viewer disappear and the number pad is visible on the J, K, L, U, I, O keys as it should be in "num lock" mode.
You'll also notice that if you press the actual space bar on the real keyboard while in "num lock" mode, you won't see the space bar on the Keyboard Viewer activated. That's consistent with it being inactivated while in "num lock" mode.
BUT if you press the space bar on the Keyboard Viewer (by moving your cursor to the pace bar and clicking in it), not the real space bar on the real keyboard but the simulated one on the Keyboard Viewer,
it appears to function like a real space bar.
I tried it in a plain text doc and it worked. While in "num lock" mode, I was able to type two numbers by using the real numeric keypad on the real keyboard, then click the Keyboard Viewer's space bar and insert a space, and then type two more numbers from the real keyboard.
Of course, I don't know if the above work around will work in your particular software application, and I realize it's not very pretty, but it seems like it it's worth a shot.
Let us know what happens.
-- JDee