Roon on laptop white screen

If you mean you get a white screen after you’ve minimised the Roon screen, and then restored it, then indeed this is a known problem on both Windows 8 and Windows 10. See here for a thread for Windows 8.1. Searching the forum using “white screen” as the search term will show up plenty of other cases. This is an issue caused by an interaction between the OpenGL graphics library, some graphics driver versions, and the Intel HD4000 graphics hardware.