I have just discovered Fiery VUE and although it won't be something we use every day as we are more of a production environment it will certainly come in useful at times, however it seems to be doing something strange with the colours. If I print a CMYK PDF directly it looks great but as part of the VUE document the colours are much darker. Can anything be done?

(using VUE with our DC252 with onboard Fiery)