I am having trouble saving for web from Illustrator CS4. What I'm finding happens is, when you go to Save for Web & Devices... you can see a pixel of white at the top of the image that runs the full width of the document. At first I thought it was the preview and wouldn't really be there once I had saved it but it was. I first noticed this with a document that contained 2 slices so I thought that the slices I had drawn were inaccurate but they weren't. The images do not increase by a pixel but not sure whether the images distort by a pixel or whether the bottom pixel is cropped off. This doesn't happen with every single file and I've experienced it on more than one machine.
Has anybody else experienced this and know how to fix it?