Colour dodge woes

ello

I’m using PS5 at work. I add some coloured text, make a white copy of the layer, add some blur to that and choose colour dodge in the layer effects giving me a vibrant glow to the text.

I do the same at home using PS7 and instead of giving me a vibrant glow when I choose colour dodge my layer looks the same as it does with normal selected :m:

anyone know whats goin on?