Nodewords breaks mobile switching - causes tiny text on iPhone

This is a rather aggravating bug that I can't quite solve myself. I have mobile_tools running on a site which has a theme which was originally built by another studio... and also a zen-based mobile theme I created, having removed all the fixed widths in my layout and other files.

For a couple months everything was working well. At some point (perhaps after an upgrade of the site modules or the iPhone(?)) the mobile switcher stopped working. After some investigation I found that browscap was missing, so I added it and I cleared the caches. I saw one of my users had enabled redirection even though we used one domain, so I set that back to disabled and everything related to the switching was good... everything except iPhone.

When I view the page on iPhone it assumes the page is 800-960px wide when it should be only 320px wide. The result is that everything gets zoomed *way* out so that you cannot read the buttons.

I can't find any reason for this. There is no code in the CSS that sets a fixed width in my code. When I limit the width to 320px it still renders ~800-960px wide leaving a bunch of white space.

I checked this on my dev site and everything is fine.

I copied the dev theme code to live, flushed all caches. Dev site is fine, live site is not.

I reviewed all of the settings for the module in the UI and in the variables table = all the same values.

I truncated various cache_* tables. Flushed all the caches.

I added the secret code to the settings.php file. Flushed caches.

I ran the tests on both the root domain and the domain with the www. prefix after cleaning out my cookies on the iPhone. I did it after clearing the cache on the iPhone, and the history on the iPhone.

So where do I turn to next?

From what I understand about iPhone coding is that the viewport is probably being set incorrectly somewhere but I haven't found any setting for it and no reason why it would have suddenly changed.