V 3.2.6 effects not happening on stage

Just upgraded to 3.2.6

Using effect as have done on prior version

Select group of 4 fixtures (Freznos), apply colour & intensity.

Lights doing that on stage

Select group again,  effect 17 (copy of 917)

Channel list show effect applied, Magic sheet showing effect is changing colour values

Nothing happening in lights on stage

I have used Adobe reader to search all release notes from 3.0.0 - search word    effect

I cannot see anything that gives any clue that something has changed

SO - why does what worked before, not work noe

Leo Vaccaneo