[whpalmer4]

How strange. I only see the diagonal half-and-half bar if I haven't set anything yet, but you've got a style applied that suggests you did.

I just click in the Alternate Rows color box, the color chooser comes up, I select a color and close the color chooser. It sometimes doesn't take effect until the color chooser is closed, which seems like a bug, but I haven't figured out the circumstances yet.