Logo not resizing in v3.0.10

Hi

Since the update I have the logo centered using:

.brand.span3 {
    display: block;
    float: none;
    margin: auto !important;
}

but even though the “Force logo dimensions to max-width:250px and max-height:100px” is unchecked it is resizing to 269 x 133px ( Natural is 600 x296px ) it was fine before!

Any ideas?