Limewire opens but I only see a blank grey screen and the green button at the bottom
 

My iMac crashed and I has to reinstall the operating system (9.1 is what I am using)... re-downloaded limewire (latest version, though all other older versions do the same thing) seemed to download and install fine, but when I open the application all I get is a blank grey screen and the green button at the bottom... can anybody help... thanks...