thanks for posting.

First of all, I have, from within Remote Buddy's sphere of influence, 
no logical explaination for this behaviour. You should always be able 
to scroll to and through the submenu and no code exists in Remote 
Buddy that would allow to bring up the menu when pressing the minus 
sign on the remote control. The menu button is currently hardwired to 
displaying and hiding the Remote Buddy menu and there is no 
configuration option that would allow you to use any other button for 
this.

Could you please

1) Quit Remote Buddy 
2) Download http://www.martinkahr.com/files/source/AppleRemote.zip 
3) Start the contained application 
4) Activate the "Listen to Remote" box in that app

and verify that every press of a button gives you the correct visual 
feedback?

I see only two possibilities for this behaviour:

1) your Apple Remote has a fabrication error, sending the wrong 
signals for the respective button presses 
2) Apple changed the API (I did just check on my own MacBook Pro Core 
2 Duo and Remote Buddy works just fine there, so I don't think is the 
case)

For completeness, it would also be interesting, if you see any output 
from Remote Buddy on the console (start Console.app and watch 
console.log for output prefixed "Remote Buddy" while using Remote 
Buddy).

Sorry for all the questions, but it's the only chance to get an idea 
of what might be going wrong on your MBP C2D.

Best regards, 
Felix