I just tried to use a color change expression for my list box and tab background and it's working fine without any problem. But when I try to scroll down a listbox values, the scroll bar went back to the top. I am not sure whether this is usual in Qlikview.
I expect that the colour change forces Qlikview to re-render the screen and this is causing the scroll bars to return to the top. I doubt that Qlik would consider this a bug.
May I ask why you would want to flash the objects like that? It could be quite annoying for users.
Logic will get you from a to b. Imagination will take you everywhere. - A Einstein
