I ran into a problem with TwentyTen 1.1 in that image sizing wasn't working, both in Firefox and Safari. The problem didn't occur in Classic (I switched), and I was able to localize it to the style.css entry for img:
#content img {
margin: 0;
>>> height: auto; <<<<
max-width: 640px;
width: auto;
}
I don't understand why the height line is there, since auto is the default, but when listed in a theme it seems to override the parameter to <img>. Is this a bug in twentyten or in my brain?
Sorry if this has been dealt with before. I did search, perhaps unsuccessfully.