Hello,
If you have programmed the LEDs in a cue stack and the colours are snapping when go is pressed and intensity fading, it sounds like you need to go over to the Colour Fade field in the cue stack table for that particular cue, and edit the colour time to the same time as the cue fade time, for example all fades for the cue of 3 seconds.
In setup the default should be a colour fade of 3 seconds, but this could have been changed, resulting in a colour fade default of a snap.
Hope this helps and answers your query.
Edward