I also am having trouble with the logo size. I am developing my wordpress site offline using MAMP. The logo that I want to use is a simple 150×150 jpg image. (I’ve also tried a .bmp image with the same problem). I tried adding the #logo { width: inherit; } under the custom CSS line in the startuppro options, and saved the options, but nothing changed. The CSS syle sheet that can be viewed, still says #logo{width:100%}. If I uncheck that box using firefox’s inspect element mode, then the logo seems to be proper size, although it covers up the name of the site and only shows the tagline beneath it.
I am currently using wordpress v 3.7.
Any help would be appreciated