I've been runing a wordpress based site since 2009 using the atahualpa theme version 3.2 for some time now, and upgraded tot 3.7.7 to fix that i couldn't get home menu button in menu. That works flawlessy, thanks to his forum using a custom menu.
link to the site
Now i have an issue which I can't fix. When I change the size of the window of my site, the image overlaps instead of clipping, or resizing as it used to do under 3.2. I didn't upgrade the theme, but installed in a separate directory as new theme (as advised by Juggledad's post), and then customized it. This occurs within safari 5.1.7 on OS 10.6.8, on Lion and on my iPad..
Strange thing is, under 3.2 it just worked fine.. of course I could go back, but I'd rather keep my themes update to date along with wordpress.