Album art problem since 10.5.0.142 update

Clicking on the album art launches a separate window in the background that I am unable to access. I can see the window pop up if I highlight over the iTunes icon in the tastbar, but clicking on it, just takes me back to the main iTunes window. I did not have this issue prior to the 10.5.0.142 update. Anyone have a solution?

Windows 7 Profession 32-bit