AnalogWrite not allowing different values on a port

I'm building a super simple RGB LED controller but in the process have stumbled across what appears to be a bug in the analog write code. If I have code as shown below all outputs on port 2 have the same duty cycle, regardless of what duty is set by AnalogWrite.

/*
Simple Test of analogWrite showing problem*/

int rLedPin = P1_6;      // select the pin for the LED
int gLedPin = P2_5;      // select the pin for the LED
int bLedPin = P2_4;      // select the pin for the LED

void setup() {
  // declare the ledPin as an OUTPUT:
  pinMode(rLedPin, OUTPUT);  
  pinMode(gLedPin, OUTPUT);  
  pinMode(bLedPin, OUTPUT);  
}

void loop() {
  // write three different outputs
  analogWrite(rLedPin, 10);
  analogWrite(gLedPin, 100);
  analogWrite(bLedPin, 200);
  delay(1000);
}

I would expect to see three distinct duty cycles but my logic analyzer (and observation of the LEDs) shows this isn't happening. 

I'm using a Rev 1.5 MSP-EXP430G2 Launchpad with an M430G2553 installed. My version of Energia is 0101E0012.

If anyone can provide any suggestions as to a work around, or point out the flaw in my understanding of AnalogWrite and the MSP430s I'd really appreciate it.

Thanks,

Mike.