Color panel stretches each time I use it until it is no longer visible

This is a strange little problem. I have been changing the colors of notes using the Inspector side panel. When I click on 'color' it brings up the range of color palette options a separate window- cool. However, each time I do this the empty space between the color palette options at the top of this window (scale sliders, colored pencils, spectrum, etc.) and the actual color options grows... Each time it does this, until eventually the colors are below the bottom of my screen. Although the window is growing and growing like something out of Alice in Wonderland, it is unfortunately not possible to scroll down it. At this point my only option is to quit out of Musescore, reopen and start the process over. I can color maybe 6 note selections before I have to do this. So peculiar.