Also, screenshots don't show the grey lines, so it looks more like it's a rendering problem, ie X doesn't intend to show the lines. Changing the desktop background has no effect, either - the lines remain until I restart X.
Also, screenshots don't show the grey lines, so it looks more like it's a rendering problem, ie X doesn't intend to show the lines. Changing the desktop background has no effect, either - the lines remain until I restart X.