Just downloaded the current versions of both WP and WooTheme's TMA theme. It appears TMA forces only fixed-widths for images displayed on the home page excerpts - specifically 470px. I had decided to re-code all the columns to be fluid, to accommodate different browser/platform combinations, and to take full advantage of the available space on smaller screens.
To try to make the front-page excerpts' image attachment size fluid as well, I've also changed the home.php latest-post-image block array's 470px specification to "auto."
This is displaying fine in everything except the Firefox/Windows combination. Anyone know why?
I've also tried a number of other css fixes, including adding "width: auto;" to all the pertinent css style blocks, with pretty much negligent results. I've pretty much spent the whole day on this problem.
Thanks for any help.