Resizing issue is PS7

I've had a mooch through the memories and can't see the answer to this anywhere, if I'm just being blind, sorry and can you just point me in the direction!

Anyway, when I resize an image down into 100x100 from a larger image *sometimes* I get a faded 1px border around the image, which is quite annoying. I say sometimes as I don't always notice it. I was just wondering if I have some setting wrong somewhere, any ideas?

Initially I thought it might have something to do with the fact I do all my base preparations while the image is still large, so I resized first but I still get the problem.

There a screenie behind the cut just to show exactly what I'm on about...



The only thing I'd got round to doing before I took this screenie was sharpening the image before reszing.