Created from a Support request:

Fisheye/Crucible exhibits display refresh issues related to dynamic parts of the display, when using IE9. Typically this will be in the form of solid black rectangles that may obscure some of the display (see screen shot, which I will attach).

Easy workaround: click the 'compatibility mode' icon in IE9, this solves most of the problems but causes a few different ones. It would be nice to see this application natively compatible with IE9.