Looks like there is a problem when LB has been open for a while, elements of the games details panel, like clear logo, media, etc... stop refreshing. The clear logo can get stuck on one game even when selecting other games, and the media stays empty. This is with the default theme.
*edit* I also noticed when I close LB at that point it doesn't close and has to be task killed and seems to be using a large amount of memory in task manager.