I think I have found a little bug in the Shadow4 skin. I have downloaded the Shadow4.r2skin-addon because I want need the german language. My desktop background is black and the event and todo windows show a small line with 2 pixels height. I thought that the problem came from the used png files and I opened the files "Events-bg-German.png" and "Todo-bg-German.png" with a graphics program, but there seems to be no error in it. I also tryed to combine the german and english files to a new one but the error is still there.
Today I switched back to english an I saw, that the TODO window in english also shows the bug. The english events window never shows the bug.
I have attached a screenshot from the problem. The RGB value of the line (drawn to my black background is 6/6/6.