Vray Sun glare not working

[Morne]

but the sun IS in the viewport. am I missing something? this has always worked before with a similar setup

No that is NOT the sun
That is only the icon representation of the sun. If you draw an infinate line from the sun target, through the sun, then you'll see the vanishing line goes out the viewport. At the "end" of that vanishing line is where your sun ACTUALLY is when rendered.

If you want the sun to be where you see it in viewport, then align your sun target to your camera

[TerriBrown3D]

I've been doing this for more than 15 years and I've just learnt something (basic) new! My goodness. Thank you Morne

[fixeighted]

I've been doing it for the best part of 25 and I still either learn new tricks or have to relearn/update forgotten ones...it's a big club you're a part of