Thanks Joseph,
To be clear, I am "he." Steve has contacted me directly (I'm assuming after posting this) and I'ves sent him a fresh copy of styles.php just to make sure there wasn't something strange in his current file. It did not change anything. My guess is that the issue is related to the server change and setup and not the theme since Envy is working just fine on 1.9.x on all of my test installations.
With that said, though, Steve - it might be a good idea to check the permissions on the CSS files and styles.php.
Themes
Envy Theme broken after Moodle server change/upgrade
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