Hi Wambulance,
When you install the Acceleration Pack, there is a point during the install that it asks if you want to remap your keys to the new Acceleration functions. Could it be that you didn't say "yes" to that?
If that's what the problem is, it's not a disaster because you can still map them manually from the FSX Home screen, via the Controls > Keyboard settings.
The ones you want to remap are listed on the back cover of the user guide that came with your Acceleration Pack.
Hope this helps.
- Voodoo