I have the akai mpk249 keyboard and cant get any help from akai with 2 problems
1) the G# note wont play, it plays in other DAWs and synths but not in sonar x-3
2) I cant get the control surface functions such as stop play rec and rewind functions to work in sonar
 
dell laptop inspiron 17 with core i5, sonar studio x-3 presonus audiobox 22vsl
 
thanks for any help

1) if you have already configured Control Surface in sonar, try to temporarily remove it to see if G# works. It can happened that you have assigned G# to some Control Surface function, so it is blocked.
2) which plug-in are you using? Generic Surface or ACT MIDI? In both there are "Learn" functions, but they are a bit different. Also your AKAI can be configured to send something they do not understand.
In any case, SONAR Reference Guide (chapters 40 and 20) and my site (see my signature) explain everything in details.
 

Also make sure in Edit -> Preferences -> Customization -> Keyboard shortcuts
that there is not a midi 'shift' option on the missing key (lets you use midi keyboard keys for shortcuts).

I have the MPK261 (61 key version) and I made a thread about the same thing really. Here's my thread if there's any help in it.
I'm still figuring it out myself.
 
http://forum.cakewalk.com/My-new-Keyboards-Transport-controls-arent-working-m3159069.aspx
 

I got mine working. Check my thread.