Solid line of pixels in my warped gradient. Can anyone explain/help?

Hello all,

So this is very odd. Here's the breakdown and steps I've taken so far.

I create a new layer and fill it with black. Then I make a new layer and make a marquee selection. Within the marquee selection, I fill the new layer with a color to transparent gradient fill. I then take the new gradient layer and warp it using the "FLAG" preset. I adjust the bend to 20% and commit the warp/transformation. I get the curve I want, but right in the middle of the curve, running straight up the layer, is a solid line of pixels. It's almost as if, that one little line missed out on both the gradient itself as well as the warp effect.

Very odd indeed. Can anyone please explain what might be happening with that?

Much appreciated.

v/r

Jake McCarthy