Login Image Display Issues

Hey all,

Testing out the 1.0.3 version of login-image (as part of wpmu rebranding) and having some display issues. First a .png with transparency (and a drop shadow on the text if it matters) is showing as an all black background. Also, the image (and I've tried a couple) seems to continually get placed too far to the left of the login section. Check out the screengrab to see what I mean.

*Edit* Screen grab comes from Chrome on Mac