Whatever I do this script never seems to work for me. Can someone explain what is the circumstances that make this script run? I have gotten it to work a few times, but I can never get it to work when I want to. It just stays grayed out and I never can get it to work. There are no errors messages as it is always greyed out. I am using 2.7.2 as compiled by Partha, and Vista.
So can someone explain what you need to do in order to get this script to work?

Thanks,
Willy

Where are you going in GIMP to get to round corners.

There are several ways to do rounded corners on an image. If you are using a jpg image, you need to right-click the layer and add an alpha channel.

Filters>Decor>Round Corners
While I have an XCF open

Well, Willy, apparently you need to flatten the image (remove alpha channel) to get it to work. The other rounded corners need an alpha channel.

Right-click your image layer and select flatten. Then try the filter.

Thanks O
As always you are a huge help,
Willy