Ok. the good news is that After stacking the grey images can be "restored" back to full colour by using the saturation, luminance, and RGB sliders as per Barry's tutorial
.
It wasn't an issue with wrong settings as I made sure the advice given by Bojan was done but yet still had grey out.
I have also contact the developers and they have responded to me. They are looking into it for me.
But, it seems that saturation levels is the way to go.
However, I will be doing a direct comparison with DSS and AIP4WIN over the next few days and will post the differences. I am still concerend that DSS may strip resolution and or colour vibrancy from the original which no amount of satuation tweaking can restore - so I will do a compariosn and post for comments...